Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c68cdaf35cd895…

MALICIOUS

PDF

35.0 KB Created: 2020-09-02 03:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c998a887b61a74d533a47f8ab9728d9 SHA-1: 0c195ed5ec43e659d6a28541a69d463bd988ff46 SHA-256: 71c68cdaf35cd8957d821ab8011edf9d90e27ffd00c3ef69d698a41540026b2a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a malicious site. The document also functions as a link farm, pointing to numerous other PDF documents, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector and the link farm strongly indicate a malicious intent.

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=do+fish+ever+google+feud+answers+2018
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/6cfc61_f0b8e978b2724019927372705c0e8500.pdf
    • https://static.usrfiles.com/ugd/96768c_07422541b6434377b07c559b44152160.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_b27e5254d40241c097127e21a80e1f0c.pdf
    • https://cdn.shopify.com/s/files/1/0432/3062/5947/files/fudamoluramudatobujofow.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/medical_certificate_for_school_leave.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/hallelujah_chorus_piano_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0462/3043/8039/files/gujopabevikonarizavixewo.pdf
    • https://static.usrfiles.com/ugd/83d902_e2a08b05f96f449c8ff60dd08114950f.pdf
    • https://static.usrfiles.com/ugd/d4579c_1944acfad5aa40108ff04c395ab0cddd.pdf
    • https://static.usrfiles.com/ugd/b8c837_c501d8fa13944c5da4245ccb5664cdc9.pdf
    • https://static.usrfiles.com/ugd/51c472_b66a489d3f65443884b3226071ca7f1f.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_off00004945.bin
79a9e3a4fd8eb3533fc8cbfaa6b5490a439a472e10f60811950d9138eea9376e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4945 5840 bytes
font_01_sfnt_off00005d43.bin
77d96956746b1af2611957ed08cb89aefbb66216588ef989fb1322e334aed0ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D43 10028 bytes