Malicious PDF — malware analysis report

Static analysis result for SHA-256 401a1fcf7d0e6e0a…

MALICIOUS

PDF

108.1 KB Created: 2020-11-05 23:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6f8ef4e1894b796015348189f18f5cf4 SHA-1: d86f69a9a615faa209a408bbe5aa7af111ea3029 SHA-256: 401a1fcf7d0e6e0a739d366c6d007b3fd24a016ba96c7a59a4ea2925b7db3f74
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM'. The document body, though partially corrupted, includes a URL related to 'piano roblox sheets', suggesting a lure to drive traffic to potentially malicious or scam-related websites. The ML classifier also strongly flagged this PDF as malicious.

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/aws?keyword=piano+roblox+sheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381730/normal_5f8f1884cc643.pdfIn PDF document text
    • https://rofofomigedug.weebly.com/uploads/1/3/4/4/134486696/5d130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427284/normal_5f986dedd9509.pdfIn PDF document text
    • https://gumiworawogulaf.weebly.com/uploads/1/3/4/3/134356348/leriseb.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/5b9fb2c9.pdfIn PDF document text
    • https://reredutubonuki.weebly.com/uploads/1/3/0/7/130775370/fenis.pdfIn PDF document text
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/libakez.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/nimuwet/beravutatusobuxexepew.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/talajo.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/puzelu.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/helix_jump_unblocked_games_for_school.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/jozexafizugotulok.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15385 3036 bytes
SHA-256: 99ded188e226e39593a4890b6298adbe856badd97d15f700ba9500dddfb2f533
font_01_sfnt_off00015e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E4E 4980 bytes
SHA-256: 44218f559e8043605e15acf58453640a21bd345a6e54d84aaf0e6dc8af0612d1
font_02_sfnt_off00016f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F36 17004 bytes
SHA-256: fa82f3549113420ff06f872b6ecd67ed78bc38a6fb6bf76715b9974de55464a2