Malicious PDF — malware analysis report

Static analysis result for SHA-256 161a398239d99a42…

MALICIOUS

PDF

57.4 KB Created: 2020-08-29 17:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb0ff3f538d83b76132418a3a3f4d288 SHA-1: c4713aea4cf10d39864e4b9b09f53b123439dcbe SHA-256: 161a398239d99a426beeab8955c6e4f99d734c54f027d152bb3860f20fe87bee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high number of external links, many pointing to seemingly benign content, but one critical link to `ttraff.com` is flagged as a malicious redirector. The document body, though heavily obfuscated, contains the same URL. This suggests the PDF is part of a link farm or SEO manipulation scheme, potentially leading to malicious sites or phishing pages.

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=guru+99+manual+testing+interview+questions
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_3d7decd2b1cc4cf390df266a4601fc14.pdf
    • https://static.usrfiles.com/ugd/b8c837_07688708b6cd4f53ace3998d8b0e03cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d9df525fec94099a8c97dcaba23c6f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_a50be68bc346417ca75718a38f8bd66e.pdf
    • https://cdn.shopify.com/s/files/1/0433/3692/5342/files/vazuxamaxamukitetumumezom.pdf
    • https://cdn.shopify.com/s/files/1/0433/9856/1957/files/alimentation_bb_6_mois_menu.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa89c02855b941628bacb9b8834f225e.pdf
    • https://static.usrfiles.com/ugd/b8c837_aeba14b6879c43c8a61d852a8f1d1ae3.pdf
    • https://static.usrfiles.com/ugd/0a0016_1f048a7cd9d648ecbbaedf9c490c9dc8.pdf
    • https://static.usrfiles.com/ugd/b8c837_bcf8ae4208574a229b816d0d778b054c.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ccd83f2fa594407a9341da15e971101.pdf
    • https://static.usrfiles.com/ugd/4dd980_af9d6490a12b40d3928469d182ce9c6b.pdf
    • https://static.usrfiles.com/ugd/b8c837_91535c8b0e1d4282bde917d7e437ca87.pdf
    • https://static.usrfiles.com/ugd/ce14f3_2b186425878746b3b66ea32217356a7e.pdf
    • https://static.usrfiles.com/ugd/b8c837_df3a11510cb945359d3ca6a24c5f5986.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad5c5d54f2be471a94e0c221cdb78c6c.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_off0000a253.bin
9811dfde881687d07afa8ce63ef732e947e13e8ca71a4b4356d0e0960488e337
pdf-font-stream PDF embedded font (sfnt) at offset 0xA253 5472 bytes
font_01_sfnt_off0000b4eb.bin
09f52877e5002454764a850a5f71394826b9dc885dbed7e9737bbd859886fc3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EB 10436 bytes