Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0cff9b538d1ac2f…

MALICIOUS

PDF

35.9 KB Created: 2020-06-03 19:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: c75f11ee7e527b62e04431f7f8ef25a3 SHA-1: 5e19bbb29440b88c53611c9b1f3748b8eec459e8 SHA-256: f0cff9b538d1ac2fb4574896fc6bfe5b624f7f2459f85df10529abac7662df73
104 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various domains. The document body, though partially corrupted, contains text related to downloading 'fortnite skin images', suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The presence of multiple unknown URLs associated with this pattern suggests a distribution mechanism for potentially malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hikma-inc.com/uploads/1/3/0/7/130775987/130775987.html#how+to+download+fortnite+skin+images PDF link annotation
    • http://hnfenterprises.com/uploads/1/3/0/4/130475997/mujijusavuwibu.pdfIn PDF document text
    • http://naturalchildbirthhelena.com/uploads/1/3/0/8/130874194/3941018.pdfIn PDF document text
    • http://luckypeakpower.com/uploads/1/3/0/6/130620314/gajofa-kobadogi-pukor.pdfIn PDF document text
    • http://sierraunfiltered.com/uploads/1/3/0/6/130639706/tupedokekareravawug.pdfIn PDF document text
    • http://store.anthonymichaelfitness.com/uploads/1/3/0/2/130291939/6610906.pdfIn PDF document text
    • http://mesquitebeanmassage.com/uploads/1/3/0/3/130323616/2422027.pdfIn PDF document text
    • http://ou-sooners.us/uploads/1/3/0/7/130739128/xifas.pdfIn PDF document text
    • http://alistravels.co.za/uploads/1/3/0/4/130477372/gifud.pdfIn PDF document text
    • http://hikma-inc.com/uploads/1/3/0/7/130775987/terms.htmlIn PDF document text
    • http://hikma-inc.com/uploads/1/3/0/7/130775987/dmca.htmlIn PDF document text
    • http://hikma-inc.com/uploads/1/3/0/7/130775987/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://botojime.files.wordpress.com/2020/05/zuvotegirasawelaxuz.pdfIn PDF document text
    • https://fesenine.files.wordpress.com/2020/05/59066960728.pdfIn PDF document text
    • https://xugipoxuwigo.files.wordpress.com/2020/05/ruxomewes.pdfIn PDF document text
    • https://gefadosujugi.files.wordpress.com/2020/05/42059508219.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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000628e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x628E 9712 bytes
SHA-256: bf793c52a3adaefb0eac939f73ca991a2f4219c2df95d0a302e93be53e785f16

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