Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cfe39c24cfefc41…

MALICIOUS

PDF

36.8 KB Created: 2020-07-27 21:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09f07c3278115d02a40b192d48379bd9 SHA-1: 80376166d563f756596b1117235733a2de00037f SHA-256: 6cfe39c24cfefc414c1f1ab5a4b9e240e2a934f5b84e38825118703f5143c0f1
154 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 external PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a potential for malware distribution or phishing. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=dumbfounded+2+answers
    • http://files.theworkwithsarahmaya.com/uploads/1/3/2/6/132696174/d055331cd.pdf
    • http://files.teachconnected.com/uploads/1/3/2/7/132740614/2838634.pdf
    • http://files.hotmilkbreastfeeding.com/uploads/1/3/1/4/131409526/a4b8035a24734.pdf
    • http://files.honordaypasco.org/uploads/1/3/2/6/132682826/6793525.pdf
    • http://files.horoscopesbyvivian.com/uploads/1/3/1/8/131856883/2911955.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0291/2168/files/penewitubaniwadesorabonuw.pdf
    • https://cdn.shopify.com/s/files/1/0435/2786/4469/files/xefukogaguwafatogijibadi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6998/7223/files/65862260334.pdf
    • https://cdn.shopify.com/s/files/1/0428/0729/6163/files/setepirulo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2912/6550/files/28153777009.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/81760356886.pdf
    • https://cdn.shopify.com/s/files/1/0433/1179/2286/files/musunep.pdf
    • https://cdn.shopify.com/s/files/1/0440/6099/9830/files/64278289502.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/39038173843.pdf
    • https://cdn.shopify.com/s/files/1/0432/4936/9252/files/tafunadamosej.pdf
    • https://cdn.shopify.com/s/files/1/0429/7218/4732/files/putizubozan.pdf
    • https://cdn.shopify.com/s/files/1/0438/7287/8747/files/88363710046.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_off00005630.bin
12d686bf8733b553896d469c04008c21187b000f12afc4eeeca37b28e80651a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5630 5140 bytes
font_01_sfnt_off00006793.bin
f66caba21b3de2bf31ce729ff64f2d22f6a2d8bcd93051ff12b6b0d048dd8b82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6793 8972 bytes

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