Malicious PDF — malware analysis report

Static analysis result for SHA-256 df13b7e68b80c70b…

MALICIOUS

PDF

42.4 KB Created: 2020-09-01 09:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e419c9501f03a6eaf8ed92825d2af36a SHA-1: 263278f26d8b602350f35b9460d227b05fde12b9 SHA-256: df13b7e68b80c70b4a37f7e9f5e997329f7c21ceb4d5a7f2f1d5765de54d57d9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=google+sheets+conditional+formatting'. This URL is embedded within the document body, suggesting a social engineering lure. The presence of numerous other PDF links, flagged as a link farm, further supports a malicious intent to redirect users to external, potentially harmful, content. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=google+sheets+conditional+formatting
    • https://static.usrfiles.com/ugd/405339_aef5faa3d46b47fdb2866f2db10a45ba.pdf
    • https://static.usrfiles.com/ugd/963627_7efd89ffde4446d6837a9ce9230b1a68.pdf
    • https://static.usrfiles.com/ugd/43d598_d6be00c7a4d046bc96818269423ea6f6.pdf
    • https://cdn.shopify.com/s/files/1/0436/4523/9456/files/24202053222.pdf
    • https://cdn.shopify.com/s/files/1/0439/6164/7262/files/42169971528.pdf
    • https://static.usrfiles.com/ugd/6d59ab_66e13e7b76c94b3bb23ab441a1b8cc2a.pdf
    • https://static.usrfiles.com/ugd/fbccce_0d3a9a477b2046899acaeaf4d20ce091.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab1ce2e910374072bfb857a175e262b6.pdf
    • https://static.usrfiles.com/ugd/72216b_d4f34ce9a6e4484281da9596396bfbd4.pdf
    • https://static.usrfiles.com/ugd/850f07_f0eb403dabda44f4aadec7290757e6c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbd088194cfe4ad09ad27efdbf6862d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4c5a4c552b24ff7ade7d7a220749a44.pdf
    • https://static.usrfiles.com/ugd/4117a9_5ce7bd7cf57948ecb540698351065a8e.pdf
    • https://static.usrfiles.com/ugd/33a16d_3d61128fd20f49b4ba2feb61ba85b5ba.pdf
    • https://static.usrfiles.com/ugd/cf14a4_e7acd23bdef9482184f9c371b6c66fe9.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_off00006605.bin
6cb14ad784bebd138e0c2a69800bd099728da77f1ff74ac4b1627865e36ded79
pdf-font-stream PDF embedded font (sfnt) at offset 0x6605 5468 bytes
font_01_sfnt_off0000787b.bin
ebd616d54aa1a106580e7ff9b0d41f79fe688ce874084b93c6cfea4909fb9ea7
pdf-font-stream PDF embedded font (sfnt) at offset 0x787B 10544 bytes