Malicious PDF — malware analysis report

Static analysis result for SHA-256 856359fd5a77ae30…

MALICIOUS

PDF

44.2 KB Created: 2020-03-31 20:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 17287758764465c40ff8993d444093c9 SHA-1: 6cb82ce7063cda46b5a7d0a0a3256d16b313cc69 SHA-256: 856359fd5a77ae300eb1df58524d6925b63fc39294a5e6527451b86fd2fc44f2
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to other PDFs with numeric or generic slugs, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. The embedded URLs and the PDF structure suggest a campaign to drive traffic to a network of sites, potentially for ad fraud, phishing, or malware distribution.

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://vtgreenmountainmedicineinc.com/uploads/1/3/0/6/130621912/130621912.html#como+resolver+identidades+trigonometricas+elevadas+al+cubo
    • http://kushcrashpads.com/uploads/1/3/1/0/131069764/dfa18.pdf
    • http://mcdonnellart.org/uploads/1/3/1/3/131384638/numunezefurar_gekobevog_vupilu.pdf
    • http://kirkonmenot.fi/uploads/1/3/0/3/130379272/c159a7b8beb090.pdf
    • http://adentamexico.com/uploads/1/3/0/6/130604036/78ffc0.pdf
    • http://skatestoyou.com/uploads/1/3/0/8/130873830/082e308cb3.pdf
    • http://kipjonproductions.com/uploads/1/3/0/7/130775742/dugazura.pdf
    • http://kissmycocktail-blogspot.com/uploads/1/3/0/6/130620887/6926835.pdf
    • http://katiegrzybowski.com/uploads/1/3/1/4/131437755/sarunibutulato-mikitavokot-xuzugoput-pedinasupid.pdf
    • http://coffeeheart.cafe/uploads/1/3/0/6/130620382/tovew-xevixokibowa-puvuvotevetudu.pdf
    • http://tumblergirl.com/uploads/1/3/0/8/130813897/8bc1802ec.pdf
    • http://bestflooringretailers.com/uploads/1/3/0/2/130289369/bf5fb16576cdf2.pdf
    • http://effortlesseventsbydanyell.com/uploads/1/3/0/9/130969925/7191777.pdf
    • http://10moheganavenue.com/uploads/1/3/1/4/131437079/219484b712313.pdf
    • http://islandbeachclubsanibelflorida.com/uploads/1/3/0/9/130969312/vurek.pdf
    • http://wisebloomers.com/uploads/1/3/0/6/130621317/dcbff12867f6.pdf
    • http://romhs.com/uploads/1/3/0/7/130739371/a0459ed.pdf
    • http://blueskyhvacservices.com/uploads/1/3/1/3/131380841/8651947.pdf
    • http://alluringdresses.store/uploads/1/3/0/4/130488098/6839aebc0365c.pdf
    • http://wealthgroove.com/uploads/1/3/0/4/130493248/b86286f.pdf
    • http://fyndmycasa.com/uploads/1/3/0/7/130775248/d096126b17.pdf
    • http://keriedwards.com/uploads/1/3/0/2/130270808/xexebewasijit.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e2a.bin
44e676233837b07b1ddf7d511045a00f788e453d4369e5bd52ac5e6bf7e6d632		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2A 7780 bytes
font_01_sfnt_off00008b3d.bin
f689831a78fdc75a09928fee1cdc91396d006636b118bdc9cd58e9fd6488ec20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B3D 16136 bytes

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