Malicious PDF — malware analysis report

Static analysis result for SHA-256 8695cd50ec490073…

MALICIOUS

PDF

42.9 KB Created: 2020-08-14 13:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d02be0205ea6e249e83e008ad1751b89 SHA-1: af526dd500285bf8a1b3f0191326cdc971de2670 SHA-256: 8695cd50ec490073a39e43b6c2f639d9ffe7f872e914f4b2d6f6ec6541dbbe12
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://ttraff.cc/wb?keyword=a%20retrieved%20reformation%20worksheet%20pdf, which likely serves as a gateway to further malicious content.

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/wb?keyword=a%20retrieved%20reformation%20worksheet%20pdf
    • http://files.mootingsyndicate.org/uploads/1/3/1/4/131483253/lewotidedimitufemini.pdf
    • http://files.mangaparae.com/uploads/1/3/2/6/132680922/c566c028bb7.pdf
    • http://zenifijud.masterhomeloan.co.nz/uploads/1/3/0/7/130738950/fewoduvubod.pdf
    • http://potimufeg.designsbymanali.com/uploads/1/3/1/8/131857419/ropewati.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0607/3759/files/424980089.pdf
    • https://cdn.shopify.com/s/files/1/0428/8266/2553/files/53750977135.pdf
    • https://cdn.shopify.com/s/files/1/0434/8159/6066/files/rizidonewu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0324/0871/files/math_games_for_grade_1.pdf
    • https://cdn.shopify.com/s/files/1/0430/9365/5716/files/attestation_d_hbergement__titre_gratuit_a_remplir.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdf
    • https://cdn.shopify.com/s/files/1/0435/0358/3384/files/64371721332.pdf
    • https://cdn.shopify.com/s/files/1/0428/6794/9724/files/aviation_safety_essay.pdf
    • https://cdn.shopify.com/s/files/1/0446/5029/9555/files/athens_transit_map.pdf
    • https://cdn.shopify.com/s/files/1/0433/7103/6835/files/3262970706.pdf
    • https://cdn.shopify.com/s/files/1/0440/8508/4310/files/blocklist_for_transmission.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_off00006862.bin
8eb112cbe5fb50ee37351291c06c27b99951b2cf558077b77c2574c90a95cec5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6862 5452 bytes
font_01_sfnt_off00007adc.bin
84b61f6c0cf0fb9f865b14d203142782db302e10c444071a4632d661c264744d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ADC 10732 bytes