Malicious PDF — malware analysis report

Static analysis result for SHA-256 321ac1e3a6798ad8…

MALICIOUS

PDF

50.9 KB Created: 2020-11-04 14:04:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cd048f3226897436bfee85e0e23a40f1 SHA-1: 1a60c60379457a75abcee47b5406e029c7747b17 SHA-256: 321ac1e3a6798ad8622f36c1adf245dacdd1419389474c846089c6241c97a45f
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gettraff.ru/strik?keyword=my+hero+academia+dubbed+123movies In PDF document text
    • https://numuzobiw.weebly.com/uploads/1/3/4/5/134589566/juzevaxoro_xolitawopit_tajogirutigut.pdfIn PDF document text
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/1ab2c3122d2b7.pdfIn PDF document text
    • https://zipazoraxegav.weebly.com/uploads/1/3/4/3/134325660/5721555.pdfIn PDF document text
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/0dbd067e.pdfIn PDF document text
    • https://biwazasidatuf.weebly.com/uploads/1/3/4/3/134373857/4c2eca822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371003/normal_5f99136256937.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/sikalomasojo.pdfIn PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/fagojowetedo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d89847-29a0-4f7d-9f2a-e0feb38624a0/the_irishman_parental_guidance.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/60638912847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47ceb8ac-f76b-496f-8064-b393bb783cca/fuxar.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/breakthrough_plus_macmillan.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://www.gnu.org/licenses/gpl.htmlIn 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_off000060d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D1 5800 bytes
SHA-256: 31b4db3f49ce423489f3f1aceb619ff9ff9894d73f27a3331d9b2b49b83b9166
font_01_sfnt_off00007473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7473 5852 bytes
SHA-256: 4eb640e1f3fabda5edbf826275fd2b4fcf019bdef00b8e9104a7c9cd1fc42218
font_02_sfnt_off0000832a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x832A 11040 bytes
SHA-256: 6096e21f9cec16e7e4bd67c6a82fe0570a20add10bf23a56a82de8ca55e7e4e7
font_03_sfnt_off0000a917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA917 16184 bytes
SHA-256: d05fccc72f643e527d0fbc75cf0836eaa06bf534d2a05a718687c2ecc4a630bd