Malicious PDF — malware analysis report

Static analysis result for SHA-256 00f7cb3158e98980…

MALICIOUS

PDF

40.1 KB Created: 2020-08-30 05:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d15209d4cb15e6df84ec3da7e63762a SHA-1: 33f623612abc34468e6078adf08c0f2a07bc533a SHA-256: 00f7cb3158e989806072fc3bef8a376c8d1f710f3f77c897043932c2d096aff2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link redirects to the known malicious domain ttraff.ru. This indicates a link farm or redirection tactic designed to lead users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.ru/wix?keyword=folic+acid+nursing+implications
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5339/7654/files/rugem.pdf
    • https://cdn.shopify.com/s/files/1/0428/1093/3414/files/bekaza.pdf
    • https://cdn.shopify.com/s/files/1/0440/0896/4246/files/chamberlain_group_email_address_format.pdf
    • https://static.usrfiles.com/ugd/b8c837_37c45fd240a541bcb1f82a62aa723d5d.pdf
    • https://static.usrfiles.com/ugd/9c43ec_f89ad9b4bc8c45b6a1192664a704f169.pdf
    • https://static.usrfiles.com/ugd/a1fb72_7882d0f8703b49a194b7878b0652cd50.pdf
    • https://cdn.shopify.com/s/files/1/0459/9532/7655/files/cbec_full_form_in_ssc.pdf
    • https://cdn.shopify.com/s/files/1/0434/0505/0008/files/fusionner_plusieurs_en_un_seul_avec_adobe_reader.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_off00005fbb.bin
b998c553317e229c4313cec7ce530e1d227cd3e23d0ca83eeb54504e037b7bdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBB 5348 bytes
font_01_sfnt_off000071ca.bin
3b711eda2e01f02cdf7cc60f6f91c1bccc736379bc6136fd71a973c60d00744f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71CA 10120 bytes

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