Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5e7cdee6e79d46…

MALICIOUS

PDF

50.4 KB Created: 2020-04-03 05:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c392fcc574cae686e8cf30abeea0f0a1 SHA-1: ef912327846e495f0773a0fd9419fc862c0ed555 SHA-256: 4a5e7cdee6e79d46ff23ca738a132e5db5d4ab7ffb5ccd991d6bc9565a94a532
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. The document body text, though partially corrupted, indicates a lure related to a "Gta 4 vehicle mod installer v1.7". The heuristic PDF_SEO_LINK_FARM firing suggests this is part of a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://gomriz.com/uploads/1/3/0/6/130604254/130604254.html#gta+4+vehicle+mod+installer+v1.7
    • http://blessedbeewinery.com/uploads/1/3/0/7/130775127/1939996.pdf
    • http://maximilianioan.com/uploads/1/3/1/3/131383444/famopewufeb.pdf
    • http://decaledinc.com/uploads/1/3/0/2/130291874/8928982.pdf
    • http://soundfulsoul.org/uploads/1/3/0/2/130270990/diribofezutakadokeka.pdf
    • http://protea.nyc/uploads/1/3/0/7/130776073/bitizomalamo_furuzezap.pdf
    • http://lcofitness.com/uploads/1/3/0/2/130272470/dekozuxujisipoziv.pdf
    • http://redstonehill.org/uploads/1/3/0/3/130323342/7352967.pdf
    • http://districtmatl.com/uploads/1/3/0/2/130289259/1681897.pdf
    • http://thejoinfoundation.com/uploads/1/3/0/3/130379368/venuremuwinus-xazikusetapav.pdf
    • http://thepinkcoatdr.com/uploads/1/3/0/4/130491322/7154368.pdf
    • http://umbandaportugal.com/uploads/1/3/0/3/130379181/guwiwemubig_zibinitixa.pdf
    • http://ctsbarbque.com/uploads/1/3/0/6/130639157/430065.pdf
    • http://justinlocke.net/uploads/1/3/0/8/130874524/fepurakixi-pijibujopezar.pdf
    • http://vpc-1.com/uploads/1/3/0/4/130489467/garoposen-sizisor-zefus-texesuvan.pdf
    • http://lestroisbonheurs.com/uploads/1/3/0/4/130436299/kadaga_xavatabi_labar_wopejaxiles.pdf
    • http://chrisarcherphotography.com/uploads/1/3/0/5/130539336/zepimavekeb.pdf
    • http://raahulramakrishnan.com/uploads/1/3/0/5/130547884/dadow_suwuwizigu_bowokidasewuje.pdf
    • http://travopitino.com/uploads/1/3/0/6/130639690/ba51fe4.pdf
    • http://oakbank-cfbt.org/uploads/1/3/0/7/130775810/kavofosokavu.pdf
    • http://hmsincatl.com/uploads/1/3/0/5/130588376/dakopid_gudezarofufinej.pdf
    • http://kingdomlink.org/uploads/1/3/1/1/131163984/f5a40eab8ec4.pdf
    • http://5thhop.com/uploads/1/3/0/9/130969967/dokiwupexawa.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_off0000851b.bin
39838f9a445e690495bed9734bc097c2caa0e3451821e59937d102bf510c4bff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x851B 8216 bytes
font_01_sfnt_off0000a4fa.bin
dd4c8c41452858522ae2739d2ec0f24e5850ea50d383c7fed979faec26c4bbc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4FA 16508 bytes

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