Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a73f4b6546a5fde…

MALICIOUS

PDF

53.0 KB Created: 2020-08-07 04:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f29095d79649a06edd3c822bad7647fe SHA-1: a222260d0a723050c2e7ccd991f52e91ed0e5b1d SHA-256: 5a73f4b6546a5fde4bacdf8b1e2dee34a007b7ed947013b0e54b96a384078390
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, disguised as a legitimate document download. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests a link farm designed to obscure the true destination. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or redirection attempt.

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=maths+formulas+for+aptitude+test+pdf
    • http://files.melrockworld.com/uploads/1/3/0/9/130969474/4697716.pdf
    • http://files.shophandmadefarmstead.com/uploads/1/3/2/7/132741352/topamijajemug-furenonirex-tijupafamejege.pdf
    • http://files.veinclinicmb.com/uploads/1/3/1/8/131857679/xekabafi_kamotipevilum.pdf
    • http://files.bradhali.com/uploads/1/3/0/8/130815726/wawij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/2329306662.pdf
    • https://cdn.shopify.com/s/files/1/0428/3868/7900/files/golomedigivegiwevipupad.pdf
    • https://cdn.shopify.com/s/files/1/0434/4227/4471/files/chemistry_notes_for_class_12_chapter_1.pdf
    • https://cdn.shopify.com/s/files/1/0428/8135/1839/files/da_form_31.pdf
    • https://cdn.shopify.com/s/files/1/0429/5763/5735/files/sogivojutexevixekonir.pdf
    • https://cdn.shopify.com/s/files/1/0435/3966/0954/files/4287424776.pdf
    • https://cdn.shopify.com/s/files/1/0430/6416/4506/files/zigobereverepadezedozu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7676/4327/files/gikajotenisopixaxame.pdf
    • https://cdn.shopify.com/s/files/1/0436/9140/9562/files/34190984584.pdf
    • https://cdn.shopify.com/s/files/1/0431/8196/5474/files/dolomi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4958/1730/files/takug.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b3f.bin
2c642d1f117b9958d5949dbaa5146bab73ff7e719974dfd972b57563de5a8726		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3F 5284 bytes
font_01_sfnt_off00008d16.bin
be2133d94716ff43be4e4c4ac685469739ddfe3942bf8cb88f5eff5014b8ef85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D16 10524 bytes
font_02_sfnt_off0000b108.bin
ae5557af49abc92bb6811f7f6f07840ad89e598f74b4a8be53303c75117e0577		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB108 16272 bytes

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