Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ea8327f5294334…

MALICIOUS

PDF

32.2 KB Created: 2020-08-03 16:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 461e74ec0e2d6a0bc7f2ffab5c7da0b6 SHA-1: 612561858912bb77d12c1c080677f2ea18002309 SHA-256: 65ea8327f529433463b269b8b41773afee19cf3d35812d89e27c9cf1f69f4a0b
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/wb?keyword=principles%20and%20techniques%20in%20combinatorics%20pdf%20free%20download'. The document body, though partially corrupted, also contains this URL, indicating the primary intent is to redirect users to malicious content under the guise of a free download. No scripts were extracted, but the presence of malicious redirectors and a large number of external links strongly suggests a phishing or malware distribution vector.

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/wb?keyword=principles%20and%20techniques%20in%20combinatorics%20pdf%20free%20download
    • http://files.vasilisaart.com/uploads/1/3/1/4/131438353/bifulafomaxelunefef.pdf
    • http://files.sleepfairwaymedical.com/uploads/1/3/1/3/131380848/kasameki.pdf
    • http://files.lordsperformancehorses.com/uploads/1/3/2/6/132681985/6de83c.pdf
    • http://files.writercassmichaels.com/uploads/1/3/1/8/131856627/4144677.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1464/2069/files/duwuvokupon.pdf
    • https://cdn.shopify.com/s/files/1/0432/5248/2208/files/75040784659.pdf
    • https://cdn.shopify.com/s/files/1/0435/8343/9011/files/zelorirubaxolulale.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/94650970230.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2856/files/fipimipo.pdf
    • https://cdn.shopify.com/s/files/1/0440/5608/4630/files/taxulu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4718/1718/files/xadesuzukoga.pdf
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/84215774092.pdf
    • https://cdn.shopify.com/s/files/1/0433/1316/8542/files/94355782853.pdf
    • https://cdn.shopify.com/s/files/1/0435/1882/0511/files/2007_honda_fit_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nulanevu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/97812382483.pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4024/files/23853072199.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31321710084.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/bomaxosikapavexelim.pdf
    • https://doi.org/10.1142/9789814355162_0002https://doi.org/10.1142/9789814355162_0004https://doi.org
    • 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_off000043ec.bin
c044e3f6e5f3e84b9a08a6cb9482daf7d542a519dbcd50d6b56ff5c0ac355729		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43EC 5752 bytes
font_01_sfnt_off00005761.bin
e394ddbc112c51668fc5c3bfbc10ee9fb47092d366ad526ccc4a355d9f3a918c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5761 8216 bytes

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