Malicious PDF — malware analysis report

Static analysis result for SHA-256 878ceb5b35c5f637…

MALICIOUS

PDF

42.7 KB Created: 2020-08-21 15:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 413bf1014f32e2e0d72d66de614bae15 SHA-1: 9ef2abad3289cb4e86ad74f85d1d249ce57e603a SHA-256: 878ceb5b35c5f6371b3b56a0c266d6c337b108417a409b1b41519ccded4574a8
170 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=attachment+application+letter+sample+pdf', reinforcing the redirector finding. The presence of numerous external links and the ML classifier's high confidence score indicate a malicious intent, likely to redirect users to further malicious content.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.com/pify?keyword=attachment+application+letter+sample+pdf
    • http://files.pieceworkjournals.com/uploads/1/3/1/3/131379049/fagod.pdf
    • http://files.texler.org/uploads/1/3/2/6/132681392/43451e289b9b4.pdf
    • http://files.sdstarresources.org/uploads/1/3/0/9/130969723/d7d7ebcb7cf42.pdf
    • http://files.sir53oakmont.org/uploads/1/3/2/7/132712127/a8cc2768b0063b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0553/4620/files/android_alpha_animation_not_working.pdf
    • https://cdn.shopify.com/s/files/1/0432/8908/4068/files/xogasebebafidabujameguz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0094/6073/files/xeporelusebumubajixil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fixasitisajixumazurezeve.pdf
    • https://cdn.shopify.com/s/files/1/0434/0465/6797/files/69743399622.pdf
    • https://cdn.shopify.com/s/files/1/0437/2171/9959/files/guguvabig.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8232/files/zesiravewasozuno.pdf
    • https://cdn.shopify.com/s/files/1/0439/5932/0734/files/78798987252.pdf
    • https://cdn.shopify.com/s/files/1/0436/8983/6697/files/rupekerenuguzodub.pdf
    • https://cdn.shopify.com/s/files/1/0429/5540/7511/files/nakeza.pdf
    • https://cdn.shopify.com/s/files/1/0429/4000/6559/files/vimalamukitikot.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_off000066b8.bin
d12381c3af6d5eb23bbc9ee83395383e4b978808e1fa4cffbf80e69e14268f7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B8 5384 bytes
font_01_sfnt_off000078d2.bin
b758df4c299f8187d8069b64771700d9fff60332e21a061e47e050300c4587ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D2 10916 bytes

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