Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e194074e9506a5a…

MALICIOUS

PDF

39.7 KB Created: 2020-10-26 21:40:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: aace41d63ebf072d2c0cc55e5c57ea7a SHA-1: 46ff068e6a92126094f9b79915eb07c044ec54dc SHA-256: 0e194074e9506a5aca231aefd4382779115012273002ff74e254290df0040914
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous external links, including one identified as a malicious redirector. The document body, though corrupted, contains text suggesting a lure for 'poweramp full apk free', which is likely a pretext to drive clicks to the malicious URL. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector confirms the intent to lead users to harmful 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.link/123?keyword=poweramp+full+apk+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375521/normal_5f89a378e4ae6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393506/normal_5f95819bd9c3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5f8a51a337735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_5f8acda28a562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_5f93b21e1edfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367019/normal_5f9165c55ff66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5f89c08a7671d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370737/normal_5f8d5fef67d10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385613/normal_5f93deb895b85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374951/normal_5f8b65caba0f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_5f94d2f64da31.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/73672929-e1ef-4080-9ec9-55425feb4893/rulamejokavufosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b0b415d-9b84-4d46-97ca-8ea6846024bf/38101524821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e23b635-17d6-480f-9079-1bda8a30e6f5/tejugijudu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5670/1346/files/kifex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/267ba996-264c-429c-98b0-0203511f0fa7/99696274246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae6d018-7211-4e61-b842-ecd80d47cc2c/xojujowukuvabelazibitag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36bf0500-b9f2-47bf-8a2d-d7237babd2b0/cqdx._ru_new_equipment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2980c390-5ea6-4515-a3d9-5578db6dffbb/dibopabokazebobosovej.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_off00005fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD2 5028 bytes
SHA-256: 0dbdb869ea72b43f12e9ec39ac2b954e42e0e7bdc722d0a379cafc3fa4dde3f9
font_01_sfnt_off000070e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70E8 9740 bytes
SHA-256: a82e43eee3e5dfb6b62db46475126836e5e0c9e2387f99cad783a8e7c04617b0

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