Malicious PDF — malware analysis report

Static analysis result for SHA-256 737d2ac58c2b5513…

MALICIOUS

PDF

42.8 KB Created: 2020-11-05 08:59:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c81f4a4d3ebdc1ad917ff46bde076142 SHA-1: 7ec5e4de4f9b4504db132f01d8eb6f2d2ef172b5 SHA-256: 737d2ac58c2b55139e7b12a2d3d3eb0e65b3e1e99302a007cc3144de35ad3a26
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body text and embedded URLs suggest a lure related to Amazon receipts, aiming to trick users into clicking malicious links. The presence of multiple PDF links indicates a link farm, likely for SEO manipulation or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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 https://ttraff.club/123?keyword=amazon+receipts+for+purchases In PDF document text
    • https://foxevavudutis.weebly.com/uploads/1/3/4/3/134380199/9339358.pdfIn PDF document text
    • https://jugizefabugej.weebly.com/uploads/1/3/4/3/134377355/momeduwoxerasebes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5f87f42e57f72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401505/normal_5fa038209d3e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370072/normal_5f89567ac61c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390051/normal_5f9627da13180.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f8900ca389ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403541/normal_5f93763dd92ff.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/4f646a02-93f1-4a18-8d1e-916dfd005718/lepanomibesolibuxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38a8eb1d-127f-4bb9-8f11-cf0ac7ffc3b9/pitev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b73c4791-ec30-45b1-a02c-007975849646/maytag_commercial_technology_washer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/gaxepunizibimefejeva.pdfIn PDF document text
    • https://s3.amazonaws.com/tagorarib/monster_catcher_rpgs.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6857 5260 bytes
SHA-256: 9bb86c286c3f18eb068b74d6df193da4e2f298003858603efde68d7159000515
font_01_sfnt_off00007a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A15 11004 bytes
SHA-256: 5b740f7c5c28ecde87ba379bda374f4081fec56f96b8d54139b886cb86fba250

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