Malicious PDF — malware analysis report

Static analysis result for SHA-256 58639c65e020395f…

MALICIOUS

PDF

44.7 KB Created: 2020-10-13 15:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a5847a8ab8f2d0913e60631378c61355 SHA-1: 7790d115af2ee3a3a0ddcc2f9c7ba6c465b660fa SHA-256: 58639c65e020395f87951bec8fa994568fd0e598a23d1390f096573cdf00682a
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'https://ggtraff.ru/strik?keyword=steelseries+nimbus+work+on+android'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the redirector suggest an attempt to lure the user to a malicious site, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/strik?keyword=steelseries+nimbus+work+on+android In 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/1/0486/3433/1294/files/grammar_bytes_fragments_exercise_1_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9755/7654/files/raymond_murphy_english_grammar_in_use.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/0079/1715/files/7757953210.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/0206/9667/files/9869345604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f957f62-d635-45f5-93c6-01c4b4362268/29680983789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b2f8df-79c8-49cc-8652-87362217674b/78687099968.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1571/6516/files/baxaxolugabifi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7125/0333/files/34022304626.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0468/0492/6615/files/proprietary_colony_definition_and_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8e5e5ea-96b5-4db6-b8c3-5b3872e4a869/vunalodigadaxidolodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de832ad1-2098-4c35-b69b-46afb7d1e29d/65833021169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96631b04-78fb-4a27-8af4-d97f25601e43/32362830043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f4b5165-3390-4a99-a87a-a66a93a59acf/42355909915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e4e0e8b-9464-4233-958f-fd8bd135a3bf/nitawaparevi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6221 5252 bytes
SHA-256: 8d114505707b663bab26789a5e7998c4ef4857ef412cc99d0b99220e1dba98a0
font_01_sfnt_off000073e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73E3 10496 bytes
SHA-256: 1cc046b43cbebc969292771d7548e04103ff9b88eb0675be0a3d20f4616af36a
font_02_sfnt_off000097c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97C0 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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