Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c8db66fecf3453…

MALICIOUS

PDF

42.7 KB Created: 2020-08-31 13:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1a096f1ee65a9d3d053db9f74c25b61 SHA-1: 1f829cf184d444f69619ab9e9de3b8782e18e167 SHA-256: 66c8db66fecf345333a096e0a2055f2a11c815d6ca658d78ed8ce803634e0b0b
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com', which is likely part of a link farm or SEO spam campaign. Additionally, numerous other links to external PDFs were extracted, indicating a potential distribution or redirection mechanism. The ML classifier also strongly flagged this PDF as malicious.

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=Indon%25C4%2593zijas+kristie%25C5%25A1u+slav%25C4%2593%25C5%25A1anas+un
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_6079867b06b74188bb3d28203a4506a9.pdf
    • https://static.usrfiles.com/ugd/a640e9_96ef12112065459b802a9f7079b17319.pdf
    • https://static.usrfiles.com/ugd/80c1db_83f17a353e314ade80bca55c5a4c4dde.pdf
    • https://static.usrfiles.com/ugd/b58d21_21d8fd390b914e0b986f810cbd60ce5e.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/exercices_corrigs_d_atomistique_et_liaison_chimique.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/sedentarismo_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0429/3797/4940/files/differential_equations_formulas_class_12.pdf
    • https://cdn.shopify.com/s/files/1/0437/3400/7973/files/tigen.pdf
    • https://static.usrfiles.com/ugd/fd30ac_1767b8568fa0404394194298e2be57b2.pdf
    • https://static.usrfiles.com/ugd/5de1df_67268b7c949847589da4619d60103a6a.pdf
    • https://static.usrfiles.com/ugd/760101_85a83cd34bab4bc4adb2832d92a8a02c.pdf
    • https://static.usrfiles.com/ugd/90c678_b978fa5d03e048cbb1c42dede1ebb4b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e3589a9194b4ce88245409ee3968dff.pdf
    • https://static.usrfiles.com/ugd/f96b02_928f9dda5b904e27bc2f48b3fa1e55c9.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_off00006515.bin
2d1c225cf08c1eef5a1dfde50a0225061261e2e7276936e1244aa416b4c9e900
pdf-font-stream PDF embedded font (sfnt) at offset 0x6515 5348 bytes
font_01_sfnt_off000076ab.bin
37e3db9c8f91001c4f3e8d1329e7c90e17b071ee6ca1348f8dbd1e1f6988f01f
pdf-font-stream PDF embedded font (sfnt) at offset 0x76AB 12128 bytes