Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c8860f0a585851…

MALICIOUS

PDF

36.9 KB Created: 2020-08-26 02:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdb0dad38db5dc1c6d3dd7ba465ee3a0 SHA-1: 5f32f79b89bebf4ad053c6a09814f532c79d0295 SHA-256: b4c8860f0a5858511c16cc9646e445af078d879bd7265aad4516fee7345c26a6
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=download+adobe+digital+editions+2.0.1', is flagged as a known malicious redirector. The document body also contains garbled text alongside this URL, suggesting an attempt to disguise or obfuscate the malicious intent. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to distribute the malicious payload. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=download+adobe+digital+editions+2.0.1
    • http://texisiwe.curbsidecake.com/uploads/1/3/2/6/132695492/3389e83dc6ce7.pdf
    • http://dofajut.mattmonfettlaxcamp.com/uploads/1/3/2/6/132696067/2390608.pdf
    • http://vuwepokij.destinationsbyjudy.com/uploads/1/3/0/7/130738667/lupir_lasujeluvurab.pdf
    • http://vusug.figsofwake.org/uploads/1/3/2/8/132814930/3390182.pdf
    • https://www.ado
    • https://cdn.shopify.com/s/files/1/0429/3168/3484/files/letewedudof.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4109/files/cisco_jabber_for_windows_planning_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/6391/8246/files/demon_hunter_season_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/9961/9492/files/54810668887.pdf
    • https://cdn.shopify.com/s/files/1/0430/5027/0869/files/ballina_rsl_entertainment_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/0867/1394/files/43140753342.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2903/files/24905648057.pdf
    • https://cdn.shopify.com/s/files/1/0437/3292/6616/files/reading_skills_file.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5825/files/vudewefubet.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f72.bin
b66610c6909da501525adc85392395a3a51cf9749a2a51fa3495d028c329079c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F72 5484 bytes
font_01_sfnt_off0000624b.bin
410b024870c137f65b2ef37806916c7e51cb04e8575f51455ac950b0db7a89e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x624B 10648 bytes