Malicious PDF — malware analysis report

Static analysis result for SHA-256 77919a57f0b39dc9…

MALICIOUS

PDF

65.9 KB Created: 2020-07-31 02:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e99fab53063613d4420282d4f06046c9 SHA-1: 027d3884eb6878654b5b3c9363bfac378e40083e SHA-256: 77919a57f0b39dc98afb1543bea7a9a417ac3beec90752f39d53983b81f05a2f
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to a redirector service, indicating a link farm designed to distribute malicious content. The document body, though heavily obfuscated, suggests a lure related to Microsoft certifications. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

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=microsoft+certification+roadmap+pdf
    • http://files.marschnereyemd.com/uploads/1/3/0/8/130814101/678484e415b8.pdf
    • http://files.juliemorganbooks.com/uploads/1/3/1/4/131453784/1736582.pdf
    • http://files.loavesandpiles.com/uploads/1/3/1/6/131607075/5698602.pdf
    • http://files.happygalsvintage.com/uploads/1/3/1/3/131398010/9825440.pdf
    • http://files.scottaforsythe.com/uploads/1/3/1/4/131411199/muxoruzuni_buzuwiruwaxut_popijezibaxumo_lodewoxid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99231100330.pdf
    • https://cdn.shopify.com/s/files/1/0434/5777/3725/files/27515776111.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97285982277.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/62565217788.pdf
    • https://cdn.shopify.com/s/files/1/0429/3502/5831/files/7149406898.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43377474007.pdf
    • https://cdn.shopify.com/s/files/1/0434/8408/6424/files/75568490548.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65069223210.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/25696095188.pdf
    • https://cdn.shopify.com/s/files/1/0437/1283/9834/files/vixomujiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/6835/8807/files/josawafojimuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/98938806949.pdf
    • https://cdn.shopify.com/s/files/1/0430/5007/4269/files/21629585861.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_off0000c4b6.bin
d3b4d4a342e32baa05ddbebe837c586329403e84ced345b9730a6ae03a6126a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B6 5064 bytes
font_01_sfnt_off0000d5c9.bin
b0956f8764c0d7b08daf9910af4a916b572dd1aaacbcf6800ebe3f682f6fe6aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C9 10536 bytes

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