Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f0b8d6ef0cd2a62…

MALICIOUS

PDF

41.9 KB Created: 2020-10-29 11:55:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90d36900f6fa16c55904a84d4ea8aefe SHA-1: 13d38e8c883e9fa0499913a00716ec8099ddb6e6 SHA-256: 0f0b8d6ef0cd2a62d4070fac22d663f264eff086f987afabd1afc762fe7d1b1c
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to what appears to be a link farm designed to host other PDFs. One prominent link redirects to a malicious domain, likely to deliver a secondary payload or phish for credentials. The ML classifier strongly indicated maliciousness, and the presence of a redirector link confirms malicious intent.

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.club/123?keyword=go+launcher+z+download+apk
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f8709a8247f9.pdf
    • https://cdn-cms.f-static.net/uploads/4368237/normal_5f9a47d5ed4a3.pdf
    • https://lefokanu.weebly.com/uploads/1/3/4/3/134377273/xifivosovut-dasurave-rujave-totuzejibut.pdf
    • https://cdn-cms.f-static.net/uploads/4378853/normal_5f8fef0056d8b.pdf
    • https://cdn-cms.f-static.net/uploads/4380530/normal_5f90d34b9e77f.pdf
    • https://dorubirema.weebly.com/uploads/1/3/4/3/134317311/b64d77548bf.pdf
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f8721091c8e6.pdf
    • https://sebonegipuwi.weebly.com/uploads/1/3/4/1/134108682/3937009.pdf
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/bc2cb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/matogapibelifiv/tigupe.pdf
    • https://s3.amazonaws.com/jiguwuzobozobaz/73277873681.pdf
    • https://s3.amazonaws.com/kudefem/6817871367.pdf
    • https://uploads.strikinglycdn.com/files/a7c7f76a-7e21-44ce-9b79-990063891306/rovaximopipugoperakeguz.pdf
    • https://s3.amazonaws.com/dapekufoxiraku/ignou_assignment_front_page_2019.pdf
    • https://s3.amazonaws.com/tedowafomaru/81411597198.pdf
    • https://uploads.strikinglycdn.com/files/fe60fc87-7d9d-4552-acfa-18d5f5383685/gender_in_cross_cultural_perspective.pdf
    • https://uploads.strikinglycdn.com/files/499a8d1b-e661-4a64-9274-827782599a86/vojofuvax.pdf
    • https://s3.amazonaws.com/bikikanafopavu/99919985639.pdf
    • https://s3.amazonaws.com/farezelof/xunagoruwujelon.pdf
    • https://uploads.strikinglycdn.com/files/5a9c26aa-7d11-436e-b148-50878a005976/zudujari.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_off0000606c.bin
263fb6a7cfb87536137cef9590f940cce47042d25d2233846bdfba8d15348de6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x606C 5220 bytes
font_01_sfnt_off00007246.bin
b16a0f28d8e8b190e0f35df00fc2715482b95f677a72ea428fcda49759c23fad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7246 12384 bytes

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