Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf1ad98466247be…

MALICIOUS

PDF

58.3 KB Created: 2020-11-24 08:18:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 09dbd318f970215bb822d878c6dac985 SHA-1: 2b71191099cd1f544e00eae1c1d21426299f8c69 SHA-256: 1bf1ad98466247be15f7e226b1025394862802a3062ca331941925dd0e9148d9
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous external links, a common tactic for SEO spam and phishing. The document body and heuristics indicate a lure related to 'free Robux', directing users to a redirector URL. The presence of multiple external links and the ML classifier's high score suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8255

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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 https://trafffi.ru/strik?utm_term=how+to+get+free+robux+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417527/normal_5f9cf1c28ce92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391319/normal_5fa67b2f88a00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391037/normal_5f913838a1d4e.pdfIn PDF document text
    • https://veraweno.weebly.com/uploads/1/3/0/7/130739577/dudurojasav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/54264a50-3f73-4004-b946-50939bea9faf/ropobunamexotololowojo.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/vagusazizipafenevag.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/arkham_asylum_100_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/lipamezujukibor.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/51224772677.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/lewis_electron_dot_structure_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d09ef2ab-ff40-494f-aa00-027e214e3437/ribbon_gift_card_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/starting_strength_book.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/seloxada.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/oxford_science_dictionary_free.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/35944832223.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B3 5260 bytes
SHA-256: 473662e2fd4829e5dcc1d090889f99d8ebc756ab02932863c7e81c1f2da0e2e8