Malicious PDF — malware analysis report

Static analysis result for SHA-256 64520ac35774c792…

MALICIOUS

PDF

59.2 KB Created: 2020-08-08 00:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b1daa7e6987faec9f2a65941a940482 SHA-1: b8cbc6219e471a729d1b7db2cb6035945aff568d SHA-256: 64520ac35774c79263623eb1bcb6879d1e2b7762ab0417cf8212e86b063c83bc
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is presented in the document body as a "Bsc courses list pdf". The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lead the user to a malicious site, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.cc/pify?keyword=bsc+courses+list+pdf
    • http://wuval.projectrunlove.com/uploads/1/3/1/0/131070161/turepofosop.pdf
    • http://zafikubej.ootmahoosewindae.com/uploads/1/3/2/7/132740930/sisod.pdf
    • http://files.eastgeorgiaservices.com/uploads/1/3/1/8/131856743/zitozun.pdf
    • http://files.nicksforzaferrari.net/uploads/1/3/1/6/131636843/dedam-welodetorilozi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemulubu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2445/files/63229841763.pdf
    • https://cdn.shopify.com/s/files/1/0434/0344/4380/files/action_and_helping_verbs_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/1561/7182/files/21335974918.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9292/files/13119892174.pdf
    • https://cdn.shopify.com/s/files/1/0432/9691/5621/files/90529608241.pdf
    • https://cdn.shopify.com/s/files/1/0428/5693/9676/files/physical_description_vocabulary.pdf
    • https://cdn.shopify.com/s/files/1/0437/2817/5265/files/pomejamebipajediwonas.pdf
    • https://cdn.shopify.com/s/files/1/0437/2915/8295/files/selutojiliwilapa.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/23549141845.pdf
    • https://cdn.shopify.com/s/files/1/0437/8080/0674/files/pdf_agama_kelas_12.pdf
    • https://cdn.shopify.com/s/files/1/0436/0349/3022/files/xoninijo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8095/8617/files/84164732732.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009d9d.bin
3f0bed30e83686f5fe3724f439f16d5f4f973a500b74ac57e12edcf2dc2c2635		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D9D 4764 bytes
font_01_sfnt_off0000ade6.bin
a72e1844e4cfba75fb1eec9f51bf0828661170e4750730b660b858cef977bfed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADE6 10480 bytes
font_02_sfnt_off0000d184.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD184 4324 bytes

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