Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3f19ebc93de483…

MALICIOUS

PDF

62.7 KB Created: 2020-08-29 21:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b2d01699456eacbe26d5dbb34e9d489 SHA-1: 39b3dd4e9dc76f93bf8894fae4d6166065f05fc1 SHA-256: 6a3f19ebc93de483cdeb82c29e4fb86a82942213cd090c8ae5e636d183b4c686
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with a critical heuristic identifying one as a malicious redirector. The document body, though heavily obfuscated, contains text related to sheet music and the malicious URL. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic to distribute 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.com/wix?keyword=journey+to+the+past+sheet+music+with
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kivamusefelozadadazub.pdf
    • https://cdn.shopify.com/s/files/1/0436/5107/2153/files/intro_stats_deveaux_4th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0448/1168/1958/files/64594382532.pdf
    • https://cdn.shopify.com/s/files/1/0429/7624/7971/files/22950458246.pdf
    • https://cdn.shopify.com/s/files/1/0429/2775/1321/files/tupaxosavizedusikaxaxitit.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/nalegegodageriwovo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1828/8277/files/96705157303.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/vawejisorevenigepejaj.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffb192fea79f455997aa342fe78ed78c.pdf
    • https://static.usrfiles.com/ugd/136d07_08fc33cc52ce42edbde479894639bca4.pdf
    • https://static.usrfiles.com/ugd/b8c837_a45926fb051d41e8aacf8757528a5a29.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_off0000b6b7.bin
25fb44a0a7dd00de04f4692e8de3161660be917d7c455ea0884a0ce3cd26f1fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B7 5324 bytes
font_01_sfnt_off0000c8ba.bin
7c5b7a181f8fe9c1c68b7e8166924fac50520624fd344c70694b137eb16e7e8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BA 10980 bytes