Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa68b2781cc16fcd…

MALICIOUS

PDF

34.0 KB Created: 2020-08-30 07:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d632bdc6e3659df300dcc18dea2a62c SHA-1: 604cec49b1939ac4a74357512634721a67737ca4 SHA-256: fa68b2781cc16fcd8e56f364072b6e734db7a46622367f2bb5bcb434bdf986d6
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically targeting searches for '5th grade math olympiad problems and solutions pdf'. The primary malicious URL identified is https://ttraff.cc/wix. The document body, though heavily obfuscated, contains references to this URL and other benign-looking Shopify links, likely to appear legitimate. The ML classifier 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.cc/wix?keyword=5th+grade+math+olympiad+problems+and+solutions+pdf
    • https://cdn.shopify.com/s/files/1/0432/0909/7376/files/argyreia_nervosa_trip_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/9073/9361/files/29271474640.pdf
    • https://cdn.shopify.com/s/files/1/0439/9444/8030/files/a_dozen_a_day_book_4.pdf
    • https://cdn.shopify.com/s/files/1/0439/9346/4990/files/zikoparururepuvumovijo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0495/2735/files/mafajixetan.pdf
    • https://static.usrfiles.com/ugd/9b33c5_fa8e15f636d74ca49f62801aa21d11c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_506f562396bf4f09bcbc7d1bd30129cd.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_77aba1929d2b4214ad8448ff81d62259.pdf
    • https://static.usrfiles.com/ugd/409ca8_df9b05a7d1b842c58f1a9fa5579a3647.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c88fd91eb284196bf4a88e69f2587c6.pdf
    • https://cdn.shopify.com/s/files/1/0461/7538/7811/files/mole_mole_relationships_stoichiomet.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1642/files/jutopepedarab.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_off000043e7.bin
e9714e941e586911a49767e94adf266c9a99156f71cdec8ddbc9a162152db485
pdf-font-stream PDF embedded font (sfnt) at offset 0x43E7 5728 bytes
font_01_sfnt_off0000573f.bin
49b81eb8bd0e51fd0f052c7093fecaac9727eae84732d6fe4ec5e6073d03fcf2
pdf-font-stream PDF embedded font (sfnt) at offset 0x573F 10936 bytes