Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee03136a4556c3a…

MALICIOUS

PDF

43.2 KB Created: 2020-11-06 06:55:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: aa9664aa05602dba270be12f1239e176 SHA-1: 2eeac610e1aa109538527156d4587d6de6c52a23 SHA-256: cee03136a4556c3a50a906c74d96596bc75252aceb387fdb5bb992a12876d984
96 Risk Score

Malware Insights

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

The PDF contains a link farm and an embedded URL pointing to 'trafffi.ru' with a keyword suggesting a lure for downloading software. The ML classifier strongly indicated maliciousness, and the presence of numerous external links, many pointing to benign-looking PDFs, suggests a SEO poisoning or link farm tactic to distribute malicious content. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/strik?keyword=netflix+download+apkpure PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388426/normal_5f9b63411ad69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367923/normal_5f8ab651afdbd.pdfIn PDF document text
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/48f855e628.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410962/normal_5f95ab028df9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404725/normal_5f9b6a520d613.pdfIn PDF document text
    • https://zojokoladateru.weebly.com/uploads/1/3/4/4/134497877/460041.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bupijila/can_t_help_falling_in_love_ukulele_fingerstyle.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/the_coolest_math_games.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/rumus_barisan_dan_deret.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8718cbe1-1429-4505-97db-bf4bc0d3da23/2351552166.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2836/3939/files/28731402059.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69C6 5048 bytes
SHA-256: 10a92625d8127f47e52d3bdfb8e693522ea5f13f94847c113ccda431f5171d67
font_01_sfnt_off00007b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B25 11000 bytes
SHA-256: 16dc99cebc2e7f94d2130215cdc498507a7578b8e2fd20df7145e0f96f3d7439