Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb7fbf47ec515c3…

MALICIOUS

PDF

43.8 KB Created: 2020-08-03 19:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b13be1ef97b16cae723624ab0099c025 SHA-1: d1b0eefcf8fcfa17b2346ea925f5a209adcdfb9e SHA-256: cdb7fbf47ec515c38a6fa4cbb9dd0f6609310f49b7a5226c661323897a49b106
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, including one pointing to a known malicious redirector (ttraff.cc). The document body, though heavily obfuscated, contains references to the topic 'structure of alkanes pdf' and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=structure+of+alkanes+pdf
    • http://files.yvckirksville.org/uploads/1/3/0/8/130874585/1418361.pdf
    • http://files.peterfosterbooks.com/uploads/1/3/1/6/131607683/lozobenaluri.pdf
    • http://files.myintrinsicbeauty.com/uploads/1/3/2/7/132740852/jiramiromob_fepego.pdf
    • http://files.custercadet.com/uploads/1/3/2/7/132710630/748b56.pdf
    • http://lomod.erhs2017.com/uploads/1/3/1/4/131453323/vuxoveti-kepitavab-gabemetesesubat.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kulabegidubonigupux.pdf
    • https://cdn.shopify.com/s/files/1/0433/6081/3208/files/jaleroka.pdf
    • https://cdn.shopify.com/s/files/1/0432/4959/8632/files/87921020215.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/32935333389.pdf
    • https://cdn.shopify.com/s/files/1/0433/2689/8344/files/32455217449.pdf
    • https://cdn.shopify.com/s/files/1/0431/0843/4077/files/dumazobavuweru.pdf
    • https://cdn.shopify.com/s/files/1/0428/4848/5535/files/50109537844.pdf
    • https://cdn.shopify.com/s/files/1/0431/3448/4648/files/95333427967.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0116/files/68578659418.pdf
    • https://cdn.shopify.com/s/files/1/0429/7873/8335/files/28022214583.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4547/files/dabuwexotevuxidimiwevefed.pdf
    • https://cdn.shopify.com/s/files/1/0433/5838/8374/files/30236689580.pdf
    • https://cdn.shopify.com/s/files/1/0437/1821/3797/files/ponunigep.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e7c.bin
9cbd8c0164f1f90a9dc6a1d19a976915ba7c957774f614a2ec963eaabb117d43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7C 5316 bytes
font_01_sfnt_off0000809e.bin
8d8d919d0e2165b5a11d4e911c438f103599b8062d20fc64f39eaa36d8da0723		 pdf-font-stream PDF embedded font (sfnt) at offset 0x809E 9976 bytes

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