Malicious PDF — malware analysis report

Static analysis result for SHA-256 83beb66386b9a5cf…

MALICIOUS

PDF

37.7 KB Created: 2020-08-30 19:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cce224071dbdd1e36675b798d42bd97b SHA-1: 953225ee3e67dbaf77308220eecbc9c93f8c0fa8 SHA-256: 83beb66386b9a5cf150b3e86dc7783ecd3fed28826f18268deb41acce888ecee
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the primary malicious URL. The presence of numerous other PDF links suggests a link farm intended to distribute malicious content or conduct phishing attacks.

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=if+everyone+cared+nickelback
    • https://static.usrfiles.com/ugd/162fe6_dfa5042f39c84e74893409ae4834bb0e.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2f3e755c7684819adf616f6772488ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_38dddddc7c7e49d583fa979dad88aae9.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae95686640544d5ca30e516b118348ac.pdf
    • https://static.usrfiles.com/ugd/ab922d_38cc5871962d445b8153395b24777bb0.pdf
    • https://cdn.shopify.com/s/files/1/0433/6982/4414/files/rijofig.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/tisimapufolekolavemo.pdf
    • https://cdn.shopify.com/s/files/1/0453/6372/4443/files/ranitazisekiz.pdf
    • https://cdn.shopify.com/s/files/1/0463/3385/3852/files/hp_pavilion_dv4000_drivers_windows_7_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/0441/1556/files/fetatubetogifexuvisodule.pdf
    • https://cdn.shopify.com/s/files/1/0435/3743/2744/files/tiwibojaletejukoto.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_off00005662.bin
0e94b755962fbbe378a43f3bf2488bbbf32e7400e64fe4c778ab6f778a0ec46e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5662 5140 bytes
font_01_sfnt_off000067f8.bin
59547aa39bbaca00cd59236b9367f4cf3e0e37e4f0e32321aa36a76bfda596d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67F8 10164 bytes

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