Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b76f6d4bb6123e…

MALICIOUS

PDF

87.7 KB Created: 2020-05-11 04:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 037f073d71886e72d9121ff0d330a704 SHA-1: f778227be7fb96c0f7c0d02fa9a165f940fcfee0 SHA-256: 61b76f6d4bb6123e2eeb0bb5fb67823193f67db8c6312158e66174f58384b564
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application T1059.007 JavaScript

The PDF document contains a lure related to 'Social media platforms banned in china' and embeds numerous external links, many of which point to PDF files. The heuristic 'SE_PAYMENT_REDIRECT_LURE' indicates a pattern of redirecting users to fake payment or bank-detail change pages. The ML classifier strongly flagged this PDF as malicious, and the presence of many external links suggests a link farm or redirection strategy to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://sauerlandhypotheek.nl/uploads/1/3/0/8/130874493/130874493.html#social+media+platforms+banned+in+china
    • http://findmeahomeutah.com/uploads/1/3/0/5/130539923/xukekagalex_nujurubiwigesu.pdf
    • http://okota.ch/uploads/1/3/1/6/131607445/rekenuzi-fofasopalis-lewawezopit-dowisomigupa.pdf
    • http://bigdumbobject.com/uploads/1/3/1/8/131856207/1384843.pdf
    • http://knafi.com/uploads/1/3/0/4/130488251/96130d23d3.pdf
    • http://adentaitalia.com/uploads/1/3/0/7/130776122/1907cfa74d83669.pdf
    • http://lianacassar.org/uploads/1/3/0/2/130270936/c5d4e687a659.pdf
    • http://rockinluxe.com/uploads/1/3/1/0/131070001/1bbcf.pdf
    • http://patriciabondrn.com/uploads/1/3/1/3/131383384/galom_vavuwa.pdf
    • http://thenakedwrist.com/uploads/1/3/1/3/131379605/c2cb3c2fe.pdf
    • http://positivepsychservices.com/uploads/1/3/0/7/130776740/gekaravawapal_zidofuvirob.pdf
    • http://doitfit.net/uploads/1/3/0/3/130379254/mixebubuxul_pisixago.pdf
    • http://perpetualcycling.com/uploads/1/3/0/6/130620603/273fd0438cda8.pdf
    • http://nsanegriplegendcars.com/uploads/1/3/0/6/130621285/ef2c79f9.pdf
    • http://seamossorganics.com/uploads/1/3/0/2/130271217/fukigij_bukoliz.pdf
    • http://counselormodesto.org/uploads/1/3/0/6/130620280/pebovosu.pdf
    • http://dosdiablos.net/uploads/1/3/1/6/131606690/45ae80ccfe7.pdf
    • http://healthandfitnessbuffs.com/uploads/1/3/0/9/130969764/nurap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dfd.bin
f2db53b542b1029c8bf48ca8244e8634301370f1161dc859a4e4c36605bfdd30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFD 8148 bytes
font_01_sfnt_off000128c9.bin
5b5a46cec52cb491ab423f1d6c6d6e12d4b8a27021bd455963153c7f4ff52bc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128C9 12184 bytes

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