Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b87eab12691e70e…

MALICIOUS

PDF

42.5 KB Created: 2020-03-24 01:45:17 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eefa44bcbc3cfc76263daffc14e55456 SHA-1: f5b7a73d552a8ffa36e7674c1523a169f1e9dbd2 SHA-256: 8b87eab12691e70e999e56b8b1435ec7616b2ec98d4119a58ea570704b0c9662
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The primary URL points to a review of gaming headset, but the majority of the embedded links lead to other PDF files hosted on various domains. This suggests the document is designed to manipulate search engine results or to distribute further malicious content through these linked PDFs. No scripts were extracted, and the document body is largely unreadable binary data with some URL fragments.

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://thismaycomeinhandy.com/uploads/1/3/0/6/130620354/130620354.html#astro+gaming+a40+tr+headset+++mixamp+m80+review
    • http://biosaints.com/uploads/1/3/0/4/130477026/sitigulov_logoba.pdf
    • http://rcgfunclub.club/uploads/1/3/0/3/130324152/nosejazuja_fufisugo_fovajirabutudum.pdf
    • http://hostmaster.practicehealth.com/uploads/1/3/0/5/130538863/boneziniwuge_kobutokos_xemiwedawopok.pdf
    • http://portraitsofwomenintheamericanfurtrade.com/uploads/1/3/1/0/131071082/jowipixa.pdf
    • http://fretbuzz.net/uploads/1/3/0/7/130775734/8399413.pdf
    • http://themetropolmedia.com/uploads/1/3/0/4/130491008/6857914.pdf
    • http://toastytunes.com.au/uploads/1/3/0/4/130490155/4716730.pdf
    • http://demoforalisonmiller.com/uploads/1/3/0/8/130814004/zeximejike-venupigewepuvo-xabum-gemikeju.pdf
    • http://beautyescapades.com/uploads/1/3/0/6/130620653/978357.pdf
    • http://www.pitterpatta.com/uploads/1/3/0/8/130813800/4338731.pdf
    • http://cleanedbychris.com/uploads/1/3/0/8/130814601/nubuwolinokaf-vosujemididit.pdf
    • http://millennialautosales.net/uploads/1/3/0/5/130590051/sinolotina_mopubolo_vomutelaviwomo_najupobemo.pdf
    • http://piconsultations.com/uploads/1/3/0/2/130272940/nurab_fiviw.pdf
    • http://fendersupply.com/uploads/1/3/0/3/130379638/725159.pdf
    • http://surlocal.com/uploads/1/3/0/4/130483343/13bd30.pdf
    • http://gryphder.com/uploads/1/3/0/7/130738845/29133cd1bb.pdf
    • http://mta-sts.mail.ttcsisseln.ch/uploads/1/3/0/6/130604855/xixipazizubuwoj-jojukumejit-timafimunad.pdf
    • http://ashnicophotography.com/uploads/1/3/0/6/130621300/347901.pdf
    • http://alfnevents.org/uploads/1/3/0/7/130775950/funelatidi.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_off00007d86.bin
ac19a99d0a081f9df3edc67d600a92f8a3900ecd1ad96f2f4670cf2a79d498bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D86 7916 bytes