Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae6a97cf4d866e6…

MALICIOUS

PDF

49.2 KB Created: 2020-03-12 11:25:58 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1dc8f5efbe08db42a08995bc2fed496c SHA-1: ba14612f3ebaa61d863f95e707bc3e4974ccc520 SHA-256: 8ae6a97cf4d866e6473ce5073d1f789316fd0ecfe46089afd09151f9f1b08259
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, contains references to URLs that are part of this link farm. The primary attack pattern appears to be a link farm designed to manipulate search engine results or distribute malicious content via numerous domains.

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://www.mattsmentalhealths.com/uploads/1/3/0/2/130287873/130287873.html#u+bahn+netz+berlin+app
    • http://saimithraimpex.com/uploads/1/3/0/2/130271009/6270696.pdf
    • http://urbanvillagefitness.com/uploads/1/3/0/5/130551206/juvawixeg.pdf
    • http://fairdebonaire.com/uploads/1/3/0/6/130621176/4514398.pdf
    • http://roaming-root.com/uploads/1/3/0/7/130739781/5428e44fc.pdf
    • http://zendla.com/uploads/1/3/0/5/130588149/nugirixuvanepenax.pdf
    • http://liqiyue123.com/uploads/1/3/0/6/130639145/a5a7ad23397.pdf
    • http://tiroler-zugspitzgolf.info/uploads/1/3/0/4/130475877/e09510140b.pdf
    • http://worldquestlive.com/uploads/1/3/0/5/130588773/259793.pdf
    • http://mycannablissonline.com/uploads/1/3/0/7/130776099/bizidavusadinesakono.pdf
    • http://azhealthybody.com/uploads/1/3/0/3/130379316/nemumujodadokivogoj.pdf
    • http://suejardin.studio/uploads/1/3/0/6/130639516/4a9a6e6c8c53ec0.pdf
    • http://ncplbasketball.org/uploads/1/3/0/5/130543684/fe6dda41b0.pdf
    • http://piratesisland.de/uploads/1/3/0/4/130483491/xetuxizalusavibevo.pdf
    • http://dansaservices.com/uploads/1/3/0/9/130969363/gatumemosazi.pdf
    • http://74-123-77-213.mgwnet.com/uploads/1/3/0/6/130603968/6382527.pdf
    • http://hostmaster.barandcateringsupplies.com/uploads/1/3/0/7/130775045/joguv.pdf
    • http://www.malasevskis.com/uploads/1/3/0/4/130479472/9909a1e3db.pdf
    • http://mrwaterheater.net/uploads/1/3/0/5/130540106/2006681.pdf
    • http://chapmanfarrellgroup.com/uploads/1/3/0/6/130621393/raguvel.pdf
    • http://fnyr1.bpmtc.com/uploads/1/3/0/8/130813369/9bf97ac2fdd.pdf
    • http://civilwarfashionshow.com/uploads/1/3/0/8/130874180/9358936.pdf
    • http://marlboroughmustangs.org/uploads/1/3/0/4/130489467/1770983.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_off00007d22.bin
f3c55fde81d3fb3d4cb2337f0e724d69df7371da1516a2c395ec142ee6558897		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D22 10176 bytes
font_01_sfnt_off0000a0af.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0AF 16036 bytes

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