Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c00aa71401e33ce…

MALICIOUS

PDF

59.0 KB Created: 2020-09-08 19:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a538add9868cf7f0ab546c84599e2359 SHA-1: 53aadf05db36fb79b84f899d529f3c174142f1c4 SHA-256: 5c00aa71401e33ce399ffc167b5ed953a41fadd54f4d38a6879fe134a11444da
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a fabricated title and references to external PDFs, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.club/wix?keyword=0.+1+formic+acid+in+methanol+preparation
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/6f58fb_aa4cd7dd888a4bd08d74ea48d6b0dcc4.pdf
    • https://static.usrfiles.com/ugd/76b6de_4e964916dea64285babc70f173d4c3eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_02fc83144f7545f687d0250a539dcb4b.pdf
    • https://static.usrfiles.com/ugd/83f04e_6beddc4f68134747ae140c8d6447abf1.pdf
    • https://static.usrfiles.com/ugd/d99ef3_adfcec2a60a143a3a0841e6568d9623a.pdf
    • https://static.usrfiles.com/ugd/685707_f9ba9cbd326d4ccd963ff50733bb4202.pdf
    • https://static.usrfiles.com/ugd/6f53d7_cbfb376498ac4b7ca98e2aea64ad6625.pdf
    • https://static.usrfiles.com/ugd/6a44d8_baf7bd6449064046aa4dc663fd3ead15.pdf
    • https://static.usrfiles.com/ugd/e78b77_609d103ea1e84be5a434dce47ef75601.pdf
    • https://static.usrfiles.com/ugd/81b904_041aeb45ff784b05a366818742bb75d0.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_0780cb98c8064d40a2f9746f9826555f.pdf
    • https://static.usrfiles.com/ugd/8ade13_3042b9b8edbb489387c9e7b0def6b4ca.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2459/files/fetivadixamibifaxisumule.pdf
    • https://cdn.shopify.com/s/files/1/0430/4008/0025/files/hedwig_s_theme_piano_music_sheet_easy.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/files/72655908278.pdf
    • https://cdn.shopify.com/s/files/1/0434/3670/3900/files/96244129042.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009296.bin
5b07c046f3c978772c49aec780081bbdfac55cb660589b5817600c41f71d42b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9296 5136 bytes
font_01_sfnt_off0000a3cf.bin
848234465f7f31e7982ca10a20975fc81ee403f1e9404d0fb03844491c55b38d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3CF 14484 bytes
font_02_sfnt_off0000d05c.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD05C 4324 bytes

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