Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a9a83205768c2c…

MALICIOUS

PDF

49.3 KB Created: 2020-08-30 18:40:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0175fe304da0ec95070a3b1c617f1e4 SHA-1: 979eec94c6142d40b10a2ec4610f53cacde8bf99 SHA-256: b7a9a83205768c2cdfa867ab77469d62ff5956a4e439bc6359dce789bbd9b459
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links, one of which, 'https://ttraff.link/wix?keyword=devious+maids+ep+guide', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Devious Maids' and the malicious URL, suggesting a lure to a malicious site. The PDF also hosts a link farm pointing to numerous other PDFs, likely for SEO manipulation or to spread malicious content.

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.link/wix?keyword=devious+maids+ep+guide
    • https://static.usrfiles.co
    • https://cdn.shopify.com/s/files/1/0459/7006/3520/files/danuwopolimebofufo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/97665911452.pdf
    • https://cdn.shopify.com/s/files/1/0430/0151/2095/files/allergenen_informatie_horeca.pdf
    • https://cdn.shopify.com/s/files/1/0429/0379/7913/files/29109601005.pdf
    • https://cdn.shopify.com/s/files/1/0431/7121/7565/files/never_goin_back_movie_parents_guide.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb28072733b24862b11105ec8d3431bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_a059dc2c93874853aeb161360491ab81.pdf
    • https://static.usrfiles.com/ugd/a467d2_e0953cf9ee2b4dc49de045ba10bee737.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8649b4894614051aeb2fadee47746f0.pdf
    • https://static.usrfiles.com/ugd/e5a943_6fdbc3a6b66b45c4a71f1f605c1bd643.pdf
    • https://static.usrfiles.com/ugd/963627_2bef0871f9d7429383f255268b250f18.pdf
    • https://static.usrfiles.com/ugd/b8c837_c33b2911070047f5bcef2f751b8f7695.pdf
    • https://static.usrfiles.com/ugd/ade4e6_2e8fc0d516494f3ca31da70c6c5d2c5a.pdf
    • https://static.usrfiles.com/ugd/50c35f_edcd39a0919d49a29cd74b51ed62143f.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_off0000784a.bin
c5c6d1574bbed8d23e8caabf962ba256142fba2a52f8d45ce4bfac9f1bd5f59c
pdf-font-stream PDF embedded font (sfnt) at offset 0x784A 5208 bytes
font_01_sfnt_off00008a00.bin
63d3063c4a522fd1c14b48848532703bbf85cf8a6eae305cd8e44cbae3d499ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A00 14820 bytes