Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ea1a2d0eff32dd…

MALICIOUS

PDF

44.7 KB Created: 2020-11-05 04:32:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc64a3af67a05ef9724b809053f8df8f SHA-1: 76f5d86856476e47aaf1a7090ca5985069997989 SHA-256: f5ea1a2d0eff32dd4109535e6df081f5a0aafd739695439d6dca2e861ff4667b
154 Risk Score

Malware Insights

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

The sample is a PDF document flagged as malicious by an ML classifier and heuristic rules indicating it contains links to known malicious redirector infrastructure and a large external PDF link farm. The document body contains a URL that is also listed as a malicious redirector. While no scripts were explicitly extracted, the presence of embedded links and the nature of the heuristics suggest an attempt to lure users to malicious websites, potentially for phishing or malware distribution.

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://ggtraff.ru/123?keyword=the+accountant+parental+guide
    • https://cdn-cms.f-static.net/uploads/4411686/normal_5fa32cd6d8f00.pdf
    • https://cdn-cms.f-static.net/uploads/4366375/normal_5f9c2c63954d8.pdf
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5f95ebc0c47ef.pdf
    • https://cdn-cms.f-static.net/uploads/4389823/normal_5f8fac84ec869.pdf
    • https://garigewofunem.weebly.com/uploads/1/3/4/3/134314314/ac3e8201.pdf
    • https://cdn-cms.f-static.net/uploads/4450734/normal_5fa362886cc4d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/2d80a82a-8bd1-4ae3-8b30-81853f75c1df/nordictrack_exercise_bike_manual.pdf
    • https://s3.amazonaws.com/kelageketisefuv/62482122733.pdf
    • https://uploads.strikinglycdn.com/files/08e8adbe-0370-49d6-bf71-dcf6ba7738ad/yaaron_dosti_badi_hi_haseen_hai_down.pdf
    • https://uploads.strikinglycdn.com/files/11f2d5dd-1e0e-4fbc-afd3-4db9605fef22/question_of_policy_persuasive_speech_topics.pdf
    • https://s3.amazonaws.com/vedexajawo/script_for_into_the_woods_musical.pdf
    • https://uploads.strikinglycdn.com/files/6a16278f-6b3d-4e13-8ebc-fd3272429d50/1596962096.pdf
    • https://uploads.strikinglycdn.com/files/9f21e684-f1e3-4f65-b66c-3bd2d526c169/dotikogosim.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063c6.bin
6816f9d98a897c5e3d2d86abed82a616f6c3200c18be311d90554b2637a9c653		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C6 4988 bytes
font_01_sfnt_off000074a4.bin
35e8df44bf20429395116983180cc63ecaccef1fbb24096a13c785f5cc04ba1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74A4 10444 bytes
font_02_sfnt_off00009824.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9824 4324 bytes

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