Malicious PDF — malware analysis report

Static analysis result for SHA-256 035e78588467b046…

MALICIOUS

PDF

117.2 KB Created: 2020-08-04 21:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e68fa5fce571e704e14395351ef3f864 SHA-1: 0470a1321d8429b7e0cf492fb7156149ef84b4ca SHA-256: 035e78588467b04689b92047325abeaf9d9b3df9df138724db924aa3f3d8a8ae
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text fragments and URLs that suggest a lure related to academic syllabi. The ML classifier strongly indicates maliciousness, and the presence of numerous external links points to a link farm strategy for SEO poisoning or traffic generation. No scripts were extracted, but the redirection mechanism is clear.

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+nursing+3rd+year+syllabus+pdf+ruhs
    • http://files.jcaconstruction.co.uk/uploads/1/3/2/7/132741149/sofobamofagavi.pdf
    • http://files.thedudern.com/uploads/1/3/2/6/132680949/xikikabuxisoxuraselo.pdf
    • http://files.advisorthoughtleadersummit.com/uploads/1/3/2/7/132710756/529535.pdf
    • http://files.vivithesupervegan.co.uk/uploads/1/3/2/8/132814898/vawigikex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/29346832097.pdf
    • https://cdn.shopify.com/s/files/1/0434/0963/7533/files/84063764159.pdf
    • https://cdn.shopify.com/s/files/1/0435/9408/8616/files/86581593208.pdf
    • https://cdn.shopify.com/s/files/1/0438/7844/9307/files/276339546.pdf
    • https://cdn.shopify.com/s/files/1/0433/7182/3262/files/10280438909.pdf
    • https://cdn.shopify.com/s/files/1/0432/7302/7749/files/21677454034.pdf
    • https://cdn.shopify.com/s/files/1/0434/6678/4932/files/39346353201.pdf
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/52700264015.pdf
    • https://cdn.shopify.com/s/files/1/0435/8114/5243/files/64024967715.pdf
    • https://cdn.shopify.com/s/files/1/0435/0348/5092/files/ernest_cline_ready_player_one.pdf
    • https://cdn.shopify.com/s/files/1/0437/3292/6616/files/adrenal_fatigue_syndrome.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_off000175f2.bin
b9eafb17775cb84471fa7e8f1437b45c6d82cd77dc0ad7a61ca7db1ad3c5da69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x175F2 5564 bytes
font_01_sfnt_off000188c5.bin
d8729feb40a16666df340638fff2b8ae3b7e89ee2d7c8ea4f7dc96fba2ce0b81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x188C5 15644 bytes
font_02_sfnt_off0001b934.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B934 4324 bytes

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