Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f25e3d6f5646736…

MALICIOUS

PDF

42.6 KB Created: 2020-09-01 04:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16db6fcbd5e9e0afc8a2b440954aeef0 SHA-1: 888210a34703716a6f93408d5cada35e5f2849ad SHA-256: 0f25e3d6f56467361b822c17983c8dd92036e200226b7ae8b68dc0b20c1e19e0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files, a technique often used for SEO poisoning or to host phishing content. One of the embedded links, 'https://ttraff.cc/wix?keyword=western+digital+colors+guide', points to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL, suggesting an attempt to disguise or obfuscate the malicious link.

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.cc/wix?keyword=western+digital+colors+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7632/9373/files/55859955702.pdf
    • https://cdn.shopify.com/s/files/1/0437/1293/8152/files/lejemumisusunitulawideb.pdf
    • https://cdn.shopify.com/s/files/1/0433/3033/8966/files/nutegifumagagi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1219/4463/files/asthma_guidelines_2019_bts.pdf
    • https://cdn.shopify.com/s/files/1/0428/3754/1031/files/bangladeshi_album_gaan_video_full_hd.pdf
    • https://static.usrfiles.com/ugd/d775a9_26738c0721574620ba645e43ef6a9149.pdf
    • https://static.usrfiles.com/ugd/b48b60_cdf564fc73844622a01f065763f6dc67.pdf
    • https://static.usrfiles.com/ugd/271e65_d6587c60588342878f13dc63f07ae318.pdf
    • https://static.usrfiles.com/ugd/314c35_0c3d334fdecd4922b7bfe70def17f19b.pdf
    • https://static.usrfiles.com/ugd/136d07_52163ebc58fb41ea96c14a732ef16038.pdf
    • https://static.usrfiles.com/ugd/b8c837_b684c3bbe04f4812baeb904e999776ef.pdf
    • https://static.usrfiles.com/ugd/105a8c_94d45798a49d4fe59fcd34e8c8f29e08.pdf
    • https://static.usrfiles.com/ugd/c12414_8ad0ac5d35854d549f18dfd5caf2e9a3.pdf
    • https://cdn.shopify.com/s/files/1/0428/5667/7543/files/centroid_of_a_triangle_formula.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/sojefawa.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_off00006699.bin
ff1a2fb38b867acd5aa90172b4eebd738b070fb50d54a02ff223efefbc0f4eb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6699 5120 bytes
font_01_sfnt_off0000781c.bin
056b6af18bd8e2a9016b802b160bcc12c892bd27d687c6b17ce35374a82f474e
pdf-font-stream PDF embedded font (sfnt) at offset 0x781C 11332 bytes