Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca32164f4c2463fe…

MALICIOUS

PDF

69.2 KB Created: 2020-10-15 00:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b0a1f5cd14856a9a7989e0197e1555ee SHA-1: 299bb7fe08744e68044cb90a1a687c13a03b419f SHA-256: ca32164f4c2463fe09f65e00da6d3d23674deb6904686ed48133010293f1c52b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable hosting services, forming a link farm. One prominent link, 'https://ttraff.link/pify?keyword=calligraphy+book+pdf+download', suggests a lure for downloading content. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm indicates an attempt to distribute or redirect to other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.link/pify?keyword=calligraphy+book+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f870c17e0c65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5f8768772f62f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f87695a910b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366040/normal_5f86f9e3b9cf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_5f876aebbcce0.pdfIn PDF document text
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/1429013.pdfIn PDF document text
    • https://wonigebegi.weebly.com/uploads/1/3/1/6/131606731/5118632.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/xidifopukexarevig.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/suvex-xebubonozov-gavubukegago.pdfIn PDF document text
    • https://fadusoga.weebly.com/uploads/1/3/0/7/130739873/mafezoluruzowez.pdfIn PDF document text
    • https://site-1042734.mozfiles.com/files/1042734/tukuxuxepax.pdfIn PDF document text
    • https://site-1039438.mozfiles.com/files/1039438/lejesuwozo.pdfIn PDF document text
    • https://site-1039801.mozfiles.com/files/1039801/telavobeximinisasibebavoz.pdfIn PDF document text
    • https://site-1036850.mozfiles.com/files/1036850/vijajeziwufukujager.pdfIn PDF document text
    • https://site-1040767.mozfiles.com/files/1040767/9994376252.pdfIn PDF document text
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/fezoji.pdfIn PDF document text
    • https://nogafuku.weebly.com/uploads/1/3/2/8/132815296/65bfaa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdd779f2-4990-41a8-9da1-20bea2422d75/rekifexuxusab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a31a1fa-181b-4939-8ab9-8aa2b0789c45/61739623450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b8c7db-7c73-4b5e-82d6-c0f3e4a3977e/81121591456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed376d00-ce68-42f1-84d1-600fbd81203d/90565639573.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/596053ba-8a48-4adb-ab80-9149d9647cdf/87604707584.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b69e44e-1de0-41cc-b9a7-05ae212ae6d2/saxesalomedowukopavali.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81F1 17708 bytes
SHA-256: 0f7863ad770221af1899ae2881a95c76fec851250d70991504872a6c31a875d2
font_01_sfnt_off0000babc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABC 5428 bytes
SHA-256: 323de5568b1d1cbaf8043474d9b41acca0440b4e23818f998f7b87a6db3d1321
font_02_sfnt_off0000cd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3C 10896 bytes
SHA-256: 1aaf62b15e2ed55d01b02b0938d3ee94337eccda738db1fc29bc232dc8b56082
font_03_sfnt_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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