Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a09496e1db5771…

MALICIOUS

PDF

50.5 KB Created: 2020-08-16 18:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afa9b101f785c757b3232fcf0f488d4f SHA-1: 313a888dc03a35aea5aff3d7944faebd3b47ad0e SHA-256: 13a09496e1db57714dde10cfeffd1a43dee7fc32a6b88b8a1f254cff5009bff2
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 external PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://ttraff.ru/pify?keyword=grade+7+math+final+exam+with+answers', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF links, reinforcing the lure of educational content to mask malicious redirection.

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.ru/pify?keyword=grade+7+math+final+exam+with+answers
    • http://files.ripplesoffaith.com/uploads/1/3/1/0/131071252/9fa8370e.pdf
    • http://files.trentemory.com/uploads/1/3/2/3/132302764/bidunikav_fofurixi_pemevelab.pdf
    • http://jabaxip.saseenos.com/uploads/1/3/2/7/132710621/remawo-funugogewetorir-sowomege-xibime.pdf
    • http://wedogubu.alimichelleinteriors.com/uploads/1/3/1/3/131383679/mavenevikefa.pdf
    • http://files.hannahleatherbury.com/uploads/1/3/0/8/130873791/cc7d5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dusegu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3504/0664/files/retemenidafotekiro.pdf
    • https://cdn.shopify.com/s/files/1/0437/1451/1001/files/3100293237.pdf
    • https://cdn.shopify.com/s/files/1/0437/2122/8442/files/jusorana.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/67588130775.pdf
    • https://cdn.shopify.com/s/files/1/0432/0722/9597/files/45694776264.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7637/files/felizim.pdf
    • https://cdn.shopify.com/s/files/1/0432/8295/6443/files/kalender_2020_din_a4.pdf
    • https://cdn.shopify.com/s/files/1/0434/7097/9237/files/todasalevuxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/saxon_math_grade_1_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/lebekomigosuto.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_off00008654.bin
02af70702c38c5d7152d5862a4b7ad1fe48046764da5995f5ad704c3a3475c86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8654 5416 bytes
font_01_sfnt_off000098c1.bin
591786dca94cf7e9a7e1421a7ea2bf5022e1023b6cd4c6e66fb1d613c7d6d391		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98C1 10788 bytes

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