Malicious PDF — malware analysis report

Static analysis result for SHA-256 648c68cdb54e0cda…

MALICIOUS

PDF

48.4 KB Created: 2020-10-29 23:33:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fab69cffaa323c82c28bbc236159c658 SHA-1: 25b832a20339040e42c74453746c4cd9145c8bb9 SHA-256: 648c68cdb54e0cda51de771870b9ac5b2db4ae31f5c94b15bf833c7cb415256d
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/123?keyword=face+painting+stencils+nz In PDF document text
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/34b1c53ce27.pdfIn PDF document text
    • https://bakukumi.weebly.com/uploads/1/3/4/4/134437371/vezef.pdfIn PDF document text
    • https://rogidalot.weebly.com/uploads/1/3/1/6/131636841/3126616.pdfIn PDF document text
    • https://sumulejuno.weebly.com/uploads/1/3/4/3/134361372/7003500.pdfIn PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/dogoxujegag_sunolur_kolip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9127/2903/files/westport_public_schools_applitrack.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/al_quran_bangla_darussalam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56b808ff-8060-483b-a48c-8a38e5216502/32640774143.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/vabimorew.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/zifaseludowitasonimotibex.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_off00005b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B75 5008 bytes
SHA-256: 40434b9a2ca85b268c9a465df63a8d838ca3722d61c88af7f6bb4561c52353c7
font_01_sfnt_off00006c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C99 2984 bytes
SHA-256: aab99bc09c7e965d13e0073b3f4614c9401e96a0a2081f528aefb1defd001f45
font_02_sfnt_off00007931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7931 11356 bytes
SHA-256: 2537cfb45efe8d37ba9e79a9ad8acad612489d5f2e92aa371a8b48f26a55882e
font_03_sfnt_off00009edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EDD 16336 bytes
SHA-256: 12aba8d421747cc7b6f64e0779b2b7b17ec51a7e5f572de6077b2104e12ed3a4

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