Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5cf4ad2e999988…

MALICIOUS

PDF

104.1 KB Created: 2020-11-01 04:12:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5fd779e656ffed5a5318a4dde796bb60 SHA-1: 42ed2052777a59589aab62f564430d8c0cabb4f0 SHA-256: 4b5cf4ad2e999988dc279faf5136ec31dd4cb132800cc3f229447840cd79f007
154 Risk Score

Malware Insights

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

The PDF contains a link farm, with one primary malicious redirector URL embedded in the document body. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to host numerous links, likely for SEO poisoning or phishing. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

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.cc/123?keyword=escape+from+tarkov+therapist+quest+pharmacist In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419193/normal_5f9bc86e0b68b.pdfIn PDF document text
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/9008087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383925/normal_5f9ba102e4c05.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7190/4673/files/xutokadapomaxuvajepaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1540eb6-daa2-4da4-ac9d-8c33cbe40dee/80179798900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d0a688-0910-4cd0-b9bf-884589984f66/80691474310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47b3fbd9-f697-430e-8cac-d53ca10af666/27640039728.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37599657-9569-4240-abd9-d430c9e05b6e/88693647806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a297e24d-58b8-4551-9057-ba243ea42fac/kisezisafebilul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/2118/8251/files/detection_theory_kay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38b5aa0c-e757-4a09-85c1-0b3943ede779/farofosawaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de17fe5-52b9-4841-801b-a853b6421445/skyrim_mods_argonian_armor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f0f394d-9aef-41c5-b193-2d880e0e8702/88275055655.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00014db9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14DB9 31760 bytes
SHA-256: a54c019f9c3828728b4ec44043ff2bc0335173fb921c68f6dbcaf0ff2a815072
font_00_sfnt_off00011646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11646 5204 bytes
SHA-256: 89e320987634666076a70c331b3d70611904dc35e89adb6858844af8e9c613e5
font_01_sfnt_off0001280b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280B 11068 bytes
SHA-256: 215c2195f84474092bb6d7b41bcd83191656ed5a6ee44f4f98b9ed27e2efb8d3
font_03_sfnt_off00018457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18457 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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