Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb44d378c0eae7b…

MALICIOUS

PDF

38.2 KB Created: 2020-03-25 12:17:25 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 353e36eb53ff187920e63131453f7ccb SHA-1: 3ae8ae5bd7594222ba8aacde93917093ea01eab8 SHA-256: ffb44d378c0eae7bf6ace9cfb89c31c75a6b86ba9902615a0c055ecee43f4722
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to these external URLs, suggesting a deliberate attempt to direct users to a network of linked PDF files. The primary purpose appears to be SEO manipulation or the distribution of further malicious content through these linked PDFs.

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 http://hannabasinmuseum.org/uploads/1/3/0/6/130604370/130604370.html#examples+of+personification+in+the+veldt
    • http://orgonelovers.com/uploads/1/3/0/4/130488153/7273236.pdf
    • http://probeautyconnection.net/uploads/1/3/0/6/130639659/9781352.pdf
    • http://quattroports.com/uploads/1/3/0/5/130588390/kuzewesi.pdf
    • http://aglcap.com/uploads/1/3/0/5/130589048/bajaxabuxu.pdf
    • http://mta-sts.mail.drawmaton.com/uploads/1/3/0/7/130776081/nesux.pdf
    • http://onechurch.lutheransanjuans.org/uploads/1/3/0/9/130969018/wisavivifow.pdf
    • http://www.discounthempflower.com/uploads/1/3/0/8/130873850/6520ed72.pdf
    • http://tafserralahlam.com/uploads/1/3/0/6/130605472/tifuregowasi.pdf
    • http://luckylucianorottweilers.com/uploads/1/3/0/7/130740080/8b09739d29.pdf
    • http://fullcirclegiftsandgoods.com/uploads/1/3/0/6/130640181/kosobujozuvazasoduwe.pdf
    • http://www.pontyoutreach.co.uk/uploads/1/3/0/6/130620909/3208799.pdf
    • http://collegeshrink.com/uploads/1/3/0/5/130541137/remoli.pdf
    • http://www.leahtristao.com/uploads/1/3/0/9/130969878/0f6d6c.pdf
    • http://frescofuture.com/uploads/1/3/0/6/130604850/buzajoxeforo-poxopudix.pdf
    • http://www.bloutreach.com/uploads/1/3/0/9/130969976/sowibitevexaxan_wirepina_gupude.pdf
    • http://lyra-di-orfeo.fr/uploads/1/3/0/6/130605492/1490833.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_off00006cdd.bin
19f9d3775ab98323f9e5d91fc170fb2eba2fe3ae482b40db1ff29ed0dd47c914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDD 7428 bytes

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