Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b621b63af912cd8…

MALICIOUS

PDF

43.6 KB Created: 2020-10-31 04:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 531816fb645a68de852200c1b279a359 SHA-1: 19bad8ce5f7347b56322552256329fe229860f1a SHA-256: 0b621b63af912cd86f1527276adfcd00d19832b4090d7e80840752b8d68b26f4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector infrastructure, disguised as a question about softball. It also features a large number of external PDF links, suggesting it's part of a link farm designed to drive traffic to potentially malicious sites. The ML classifier strongly flagged this PDF as malicious.

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=who+invented+softball+and+in+what+year In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374359/normal_5f95787b7fcb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377120/normal_5f89c425180dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370547/normal_5f896149dfed1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378157/normal_5f8aa54f911f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373240/normal_5f90e0e0661fc.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/50461e86-f1c8-44c4-8cd5-601927bce729/90216363638.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/96696085722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/523a47ea-b5f0-44f5-bef1-44a11b1bd8c7/17246969476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26845857-ad03-4186-ad66-829eb0e6ca67/flawless_body_cream_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/rinuzafimexodono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26eb508c-d3f4-42e1-85ae-2e8893fe8db8/22812942303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfdba1ab-8a0e-484e-8c37-5bba66e08ddb/86925309546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18770413-799c-4fdd-a55f-1a923d4d997f/92957041634.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9343/5589/files/iso_14001_indonesia.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_off00006c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6A 5400 bytes
SHA-256: 04c8995bf506a23a7ecb869fa69c8cba80984ee9bfeaae411b78a3233ce447bf
font_01_sfnt_off00007ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE2 10104 bytes
SHA-256: a986e9b0a6960c6093c54dfc606b27e5e6572026f3896fcc84975d83701bf4ff

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