Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dee87fbb1b8da9b…

MALICIOUS

PDF

36.2 KB Created: 2020-03-30 04:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c500168ae6c024fc2820b547bec1caae SHA-1: 905950a762a0f923c047be99ce173850c396dde2 SHA-256: 2dee87fbb1b8da9bb277a0a0d07801b33db6a591514eaed699e2464bb369ac99
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to similarly structured URLs on different domains, suggesting a link farm designed to host malicious content or redirect users. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains text related to a 'Makerbot replicator 2 filament guide tube' and authoring application details, which likely serves as a lure to disguise the malicious intent of directing users to the numerous embedded URLs.

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://wcd-qnv77h4.mgh-r.ch/uploads/1/3/0/6/130604594/130604594.html#makerbot+replicator+2+filament+guide+tube
    • http://farmhub.online/uploads/1/3/1/1/131163666/vejujepijonazel-ralupajisu-xemigivurevam.pdf
    • http://nathallybastos.com/uploads/1/3/0/5/130544437/seridejevuzuwipafap.pdf
    • http://goodshepherdyouth.net/uploads/1/3/0/3/130323835/5ab63f.pdf
    • http://oldhamimaging.com/uploads/1/3/0/6/130603853/8345364.pdf
    • http://jenniebrimicombe.com/uploads/1/3/0/5/130590392/gakoxaxi.pdf
    • http://cometochristchurch.mobi/uploads/1/3/0/6/130621110/ruwesojofefavegadox.pdf
    • http://supportrealheroes.com/uploads/1/3/1/3/131378918/2a71d6d0692731.pdf
    • http://lavieenrosemacarons.com/uploads/1/3/0/7/130776533/pudev-futigimusaz.pdf
    • http://drashmani.com/uploads/1/3/0/6/130639513/5543902.pdf
    • http://carbonconstruction.net/uploads/1/3/0/7/130738841/miraweg.pdf
    • http://gterryportfolio.com/uploads/1/3/0/6/130621496/doginav.pdf
    • http://singporehealthtalks.net/uploads/1/3/0/4/130483679/4011979.pdf
    • http://mattsmithcomics.com/uploads/1/3/0/7/130739962/9406121.pdf
    • http://yogakarlin.com/uploads/1/3/0/7/130740323/1b5c360.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_off00006737.bin
4d3a372c95bf6a63d23da1e00efc63b822c488b1bdf0c1e611aea88dd726cda9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6737 7204 bytes

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