Malicious PDF — malware analysis report

Static analysis result for SHA-256 8683ed0721dc3a26…

MALICIOUS

PDF

55.8 KB Created: 2020-08-31 21:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da808a00c76d9783d7f6edef1977ca1d SHA-1: 151498c9ef93570b0c47d778c90a75581cdfc54b SHA-256: 8683ed0721dc3a26e8f13fc9238f136d9254061ba47ac9b995972970feae8085
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains numerous embedded URLs, with one identified as a malicious redirector (ttraff.com). The ML classifier strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through seemingly benign links. The document body itself is largely unreadable binary data, but it does contain the malicious URL and other Shopify links.

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=nous+present+tense+form+of+avoir
    • https://cdn.shopify.com/s/files/1/0438/6645/6224/files/pre_algebra_worksheets_for_7th_graders.pdf
    • https://cdn.shopify.com/s/files/1/0431/6548/3172/files/rente_maladie_professionnelle_pro_btp.pdf
    • https://cdn.shopify.com/s/files/1/0459/8526/7879/files/78218018754.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/rosujepifowonerezamanele.pdf
    • https://cdn.shopify.com/s/files/1/0435/1793/5770/files/vibinanexiderisunimibuwaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/3804/0487/files/alfabeto_ruso_traducido_al_espaol.pdf
    • https://static.usrfiles.com/ugd/a91264_0efab5ca99b44475a3ffe6e0d6baf6fe.pdf
    • https://static.usrfiles.com/ugd/2274a7_516281c28bed4a4ea92a392f98b03757.pdf
    • https://static.usrfiles.com/ugd/ace02d_33337aabf1434ee58f165b449d6b0dab.pdf
    • https://static.usrfiles.com/ugd/b8c837_72c5ec11d5c444f1aa132617d50e0fc7.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef2bd8778cf849fd9c7f220d72f0503f.pdf
    • https://static.usrfiles.com/ugd/b8c837_200dec761a0549228b3c935ccce8b3cc.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_off000099bd.bin
a66956647bd721121bb6d881f98ca4cb07c030ea1e6922ead7952ad870f4c8e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x99BD 5044 bytes
font_01_sfnt_off0000aad7.bin
876387dd638440135482d80e4af21ef27bddd9c6aee2615c2a65a95838a3c543
pdf-font-stream PDF embedded font (sfnt) at offset 0xAAD7 12056 bytes