Malicious PDF — malware analysis report

Static analysis result for SHA-256 7087709ed90e5c73…

MALICIOUS

PDF

38.5 KB Created: 2020-08-06 16:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08abd8dd8cd7335753370c33bb74bd2c SHA-1: 47eb4cd595df1614d80cc0e84da0d6affc1b98bc SHA-256: 7087709ed90e5c73b88632f9024003eda3cba60a935abef587400a7449cd6ed7
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing indicating it links to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=artificial+intelligence+course+pdf`. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on Shopify. The document body, though heavily obfuscated, contains the same malicious URL and several benign-looking Shopify URLs, suggesting a deceptive lure.

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=artificial+intelligence+course+pdf
    • http://files.mineheadbarbarians.co.uk/uploads/1/3/1/4/131437766/703ba23eae8a4bd.pdf
    • http://files.promaxpowersports.com/uploads/1/3/0/8/130814652/3ffa42eb58aa.pdf
    • http://files.whatsanoptician.com/uploads/1/3/1/4/131437984/5f66816abe9f765.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4939/4080/files/18299611641.pdf
    • https://cdn.shopify.com/s/files/1/0432/5684/0350/files/wuzesezamadejazataji.pdf
    • https://cdn.shopify.com/s/files/1/0429/8529/1937/files/mivasusowunuruzojomujidon.pdf
    • https://cdn.shopify.com/s/files/1/0431/5430/9284/files/add_text_to_microsoft_edge.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/jawos.pdf
    • https://cdn.shopify.com/s/files/1/0450/8601/5640/files/alchemy_rory_sutherland.pdf
    • https://cdn.shopify.com/s/files/1/0429/6101/0842/files/39430300767.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/liwukepurenugiweda.pdf
    • https://cdn.shopify.com/s/files/1/0434/6268/8918/files/catabolismo_del_grupo_hemo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9145/2314/files/96904911707.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/27835964071.pdf
    • https://cdn.shopify.com/s/files/1/0437/0857/9993/files/susinesisawotuwur.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000574a.bin
8fce3e759ed96f6f82e6017f9d9447ec37acddf94b55f665c9b91e44a560bf61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x574A 5312 bytes
font_01_sfnt_off0000696b.bin
bc4924588d1041f70be9f2cf057977cb38c1e9f0548d934a375e1b47650df9cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x696B 10480 bytes

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