Malicious PDF — malware analysis report

Static analysis result for SHA-256 17bc010c1b1138b8…

MALICIOUS

PDF

39.0 KB Created: 2020-08-03 03:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5937d0c831d0032ac0ac08d5f21808bd SHA-1: f84f8092f4105b1aed3c0798b42442a968e629aa SHA-256: 17bc010c1b1138b850dc4134163ba3127d2ddb2a2542ee062a4a7dafda5822f9
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, includes the same URL and other links to external PDFs, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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/wb?keyword=asp.net%20crystal%20report%20tutorial%20pdf
    • http://files.themoveablechurch.org/uploads/1/3/0/8/130874128/9175303.pdf
    • http://files.seraphimschool.com/uploads/1/3/1/6/131636654/3512908.pdf
    • http://files.cuestacollegerodeo.com/uploads/1/3/1/4/131483550/f518ae417.pdf
    • http://files.ancpwa.org/uploads/1/3/1/3/131380547/pukegu_libimelepusil_wixowasabegox.pdf
    • http://files.zaidmoving.com/uploads/1/3/1/4/131407469/2499960.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/zubiworagezetuzemeva.pdf
    • https://cdn.shopify.com/s/files/1/0434/7042/2180/files/72402895052.pdf
    • https://cdn.shopify.com/s/files/1/0433/4823/0297/files/gigi_d_agostino_ill_fly_with_you.pdf
    • https://cdn.shopify.com/s/files/1/0432/0890/0772/files/guriza.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mufuma.pdf
    • https://cdn.shopify.com/s/files/1/0431/7085/7124/files/rilupageserag.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/humulin_r_500.pdf
    • https://cdn.shopify.com/s/files/1/0428/3269/1363/files/xikevopigazoduvatazegad.pdf
    • https://cdn.shopify.com/s/files/1/0440/9671/6952/files/86346857186.pdf
    • https://cdn.shopify.com/s/files/1/0435/9307/2808/files/2012_audi_a7_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/4158/6332/files/65857693777.pdf
    • https://cdn.shopify.com/s/files/1/0431/2806/2109/files/rolling_eyes_emoji.pdf
    • https://cdn.shopify.com/s/files/1/0428/8099/1388/files/jailbreak_os_5._1._1.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_off00005a77.bin
c85292efb86c8b9c5ee6181543a0d0053eede3d2c5cd9757bbe65f4623ee24ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A77 5272 bytes
font_01_sfnt_off00006c85.bin
2f83ba76a5dfba2777894d642b68d230cb32df7a5bfdb77258d081962d8c3825		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C85 10112 bytes

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