Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcda67ab8c32a040…

MALICIOUS

PDF

50.3 KB Created: 2020-04-11 11:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 87817de81fb5bf15d1726aaeae1bceb3 SHA-1: 74798449a5a05ae8bf399546d0c1270c818774a1 SHA-256: fcda67ab8c32a0400ea00f13b495198095f6abce192e2a8d4d34924367c76d5d
96 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 point to other PDF files with numeric slugs, indicative of a link farm or SEO spam tactic. The document body also contains a URL that appears to be a lure for a free album download. The primary heuristic identified a "PDF_SEO_LINK_FARM" which suggests the document is part of a larger network designed to artificially inflate search engine rankings or distribute malicious content. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

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://oxnard-photography.com/uploads/1/3/0/7/130776648/130776648.html#the+carter+4+free+album+download+zip PDF link annotation
    • http://chasinghappy3.com/uploads/1/3/0/7/130739962/4a12066.pdfIn PDF document text
    • http://mobilecardetailingsimivalley.com/uploads/1/3/1/4/131437243/torutofo.pdfIn PDF document text
    • http://asunburntcountryproject.com/uploads/1/3/0/5/130540507/zivogaxupinofaraxo.pdfIn PDF document text
    • http://bootslikemine.com/uploads/1/3/1/1/131163691/5995654.pdfIn PDF document text
    • http://grupomusical.org/uploads/1/3/0/5/130540266/3217921.pdfIn PDF document text
    • http://adamhenryink.com/uploads/1/3/1/4/131438156/joligoweruk.pdfIn PDF document text
    • http://kaninpaletten.com/uploads/1/3/0/6/130620833/nawikopisapozod.pdfIn PDF document text
    • http://blservic.es/uploads/1/3/0/7/130740262/2186229.pdfIn PDF document text
    • http://hopeenterprisellc.org/uploads/1/3/0/6/130640191/sewejurilepiduzukim.pdfIn PDF document text
    • http://williamrjohnston.com/uploads/1/3/1/0/131069860/02df4e476a4.pdfIn PDF document text
    • http://sbilzi.com/uploads/1/3/1/0/131071181/3aa9a5966602.pdfIn PDF document text
    • http://iescfl.com/uploads/1/3/0/5/130551472/fedovameworulo.pdfIn PDF document text
    • http://underthestone.org/uploads/1/3/0/9/130969226/5046407.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
🗂 Part of campaign: midcentury-mod.com 4 samples

Related samples 2

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71B6 8760 bytes
SHA-256: 39892cff1e851445039b82eae1097cd1714d1369a6dfad073e564cb18f3d1b25
font_01_sfnt_off000092f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92F5 2644 bytes
SHA-256: bb48f2028fe1ad439637a07eb22338af9f1535ec846d773e7d96d9d333a872f6
font_02_sfnt_off00009c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C43 1856 bytes
SHA-256: 9387b45d21fde81e24182dd8c1bc6e08b61522584f9c5deb6d9937a0edeb8c92
font_03_sfnt_off0000a568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA568 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63

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