Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca9cc7dd60f3e51…

MALICIOUS

PDF

34.5 KB Created: 2020-05-21 23:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edc05b75f41b3669e49f48e52277ae73 SHA-1: 4dd77e393e13b8897c019a27da27fb1cf049e965 SHA-256: 4ca9cc7dd60f3e510176e070c71a400c2d4d6d7050c0272bf0e2ceefbb27df46
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on domains that appear to be part of a link farm. The document body, though heavily obfuscated, contains references to 'firefly rpg core rulebook pdf free d', suggesting a lure to download content. The primary attack pattern involves redirecting users to these numerous external URLs, which are likely hosting malicious content or further phishing attempts. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 http://yinghuangguojiyulehuisuotu.br3h.com/uploads/1/3/0/5/130588695/130588695.html#firefly+rpg+core+rulebook+pdf+free+d
    • http://onelastthingg.com/uploads/1/3/0/2/130289339/pixera.pdf
    • http://homesteaddevelopmentpartners.com/uploads/1/3/0/2/130288378/939601.pdf
    • http://kisaemigrantmuseum.se/uploads/1/3/1/4/131453631/rimumupew_zugimef_dekotodagogu.pdf
    • http://mentallations.net/uploads/1/3/1/3/131381167/ribawikelubes.pdf
    • http://jumpislandbrighton.com/uploads/1/3/1/3/131383404/mogofipib.pdf
    • http://sendmoneyinvietnam.online/uploads/1/3/1/8/131871479/6065837.pdf
    • http://thehonorarymovement.com/uploads/1/3/0/2/130287878/8588681.pdf
    • http://fizzyfest.com/uploads/1/3/0/7/130739740/pelevebu.pdf
    • http://spconnections.net/uploads/1/3/0/2/130289213/falipizafezezon-kitazonawaz-kurir-tuvesisiro.pdf
    • http://sebastopolacupuncture.org/uploads/1/3/1/0/131070938/satiwem_lawal_wodisizoxur.pdf
    • http://mail.iclasse.org/uploads/1/3/1/3/131398085/cc5ae0e276.pdf
    • http://opportunitypalestine.com/uploads/1/3/1/8/131856109/vivevadaki-piduf.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c23.bin
445dabfa95c2196322b156249b4324ed467a2019c0434b9770470c2dff911c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C23 10152 bytes

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