Malicious PDF — malware analysis report

Static analysis result for SHA-256 008749aa5c29421b…

MALICIOUS

PDF

39.7 KB Created: 2020-08-09 19:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93d78903a2692bd5f21e0184943cde66 SHA-1: 7f5d00f551f3217d06f6402dbbe09f41886bb6f3 SHA-256: 008749aa5c29421b516b33e58fe014c411ae73b6bbd9bc820487cc9f37f2730c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious File

The PDF document was flagged by a machine learning classifier and contains numerous embedded links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains references to the redirector URL and several other PDF files hosted on various domains. This suggests a campaign focused on distributing malicious content or performing SEO manipulation through a large number of linked PDFs.

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=prepositions+and+adverbial+particles+pdf
    • http://fenafumun.rollingthunderflorida1.org/uploads/1/3/1/3/131379732/puwewuziluv-rulurix.pdf
    • http://files.kenbugulfilm.com/uploads/1/3/2/6/132695663/09ac8.pdf
    • http://files.agextonline.com/uploads/1/3/1/8/131856027/wawujetexaxibopux.pdf
    • http://files.neurotherapycenterva.com/uploads/1/3/1/4/131411474/vurerari_momekaralalut_lopazaxazipep_lixikiwam.pdf
    • http://files.kerryedwardsphotography.com/uploads/1/3/0/7/130775977/3068a6ba2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6052/7265/files/bill_handel_voter_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/5774/0967/files/fevomo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0064/3236/files/47124156336.pdf
    • https://cdn.shopify.com/s/files/1/0436/7246/9669/files/47654226186.pdf
    • https://cdn.shopify.com/s/files/1/0431/6626/9600/files/lerexipo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7671/3637/files/59972353341.pdf
    • https://cdn.shopify.com/s/files/1/0437/6104/1559/files/nuwaluwebariv.pdf
    • https://cdn.shopify.com/s/files/1/0434/2621/8136/files/99332960239.pdf
    • https://cdn.shopify.com/s/files/1/0433/2004/9822/files/78056103047.pdf
    • https://cdn.shopify.com/s/files/1/0430/9444/2145/files/corporate_financial_risk_management.pdf
    • https://cdn.shopify.com/s/files/1/0431/2799/6565/files/popaporovetab.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_off00005e14.bin
c7a197fa9a0272dd9a8717388d144fdc28acdd8a7c9c2cae83a646d42bd6ca60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E14 5352 bytes
font_01_sfnt_off00007055.bin
372ba547a8bc900f10360c9df6f7f2a808a9c2c6f916da26e699b0d4560533b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7055 9884 bytes

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