Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e5ca3dcc3f1b8c6…

MALICIOUS

PDF

57.2 KB Created: 2020-09-05 13:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bac4e553c01a754c3bfacaf5c631c36 SHA-1: f42ea98e6ac1031af6ea47b979ddb889a3e07ad2 SHA-256: 0e5ca3dcc3f1b8c63fac7f42686f725983228e2f7593d1edb8cf8cbcbcedd5b2
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector service, which is a common tactic for distributing malware or phishing pages. The heuristic firings indicate the PDF is designed as a link farm, likely to improve search engine ranking for malicious content. The presence of a download button lure further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.link/wix?keyword=molality+and+mole+fraction+worksheet+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/60ffa2_0d52a8ccd22d4212a39dc07b1ef4d5a6.pdf
    • https://static.usrfiles.com/ugd/8ebb60_1437b0283fa84a0a9425b30c3f86bf56.pdf
    • https://static.usrfiles.com/ugd/740d8c_22528e2dfc1448b98b2d90179b7532f6.pdf
    • https://static.usrfiles.com/ugd/5af86b_a5677410188c4d3dbf06ab990d6ffc48.pdf
    • https://static.usrfiles.com/ugd/2ac701_d3f55096c7e0440792aa7a00c49f7cc3.pdf
    • https://static.usrfiles.com/ugd/0047a4_9bbf7fe8877842e5a7ed6e8dbcfc0ace.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8656/files/adobe_photoshop_free_softonic.pdf
    • https://cdn.shopify.com/s/files/1/0429/8709/4177/files/differential_and_integral_calculus_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/1688/7192/files/fedakopafi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080cf.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80CF 2828 bytes
font_01_sfnt_off00008aca.bin
442e1dbcdd7bb945bf7cc2ef6b720c3dad24759fc3690ee8276e78f48b3c9cc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ACA 5312 bytes
font_02_sfnt_off00009cc4.bin
288afe8ffbddd505ca4a6997bc661d1d0b042055f687277312d74ff1e3774a0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CC4 13648 bytes
font_03_sfnt_off0000c7e8.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E8 4324 bytes

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