Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb750ef02f6604b…

MALICIOUS

PDF

73.8 KB Created: 2020-12-02 14:54:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f76158b1ea10e0ac932304f2c602585f SHA-1: d0bfe8a1bb7a5085583a0e7e4bfec7963d44add1 SHA-256: 7fb750ef02f6604b657fb7873f1ffb13b9ba33e76d3d8dc5d9464645e686f845
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/aws?utm_term=mac+os+bildschirmfoto+als+pdf'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely serving as a lure for a phishing attack or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/aws?utm_term=mac+os+bildschirmfoto+als+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_5f9cb69d2c73c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481676/normal_5fc6be3860432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413012/normal_5fa0cbc5e63c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471467/normal_5fc5e51a82ffe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f96c007a79d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc06d09e5c7695ca9994347/t/5fc138f4bc819f1cf404a348/1606498548613/10577459805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dd19e37-a064-41e0-816c-0b7c11f60964/70687972057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04ca4c87-dc8f-4b98-84df-58c5bbb29991/13647305429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9528c2ce-3778-4ef3-834c-9a1e6098b57e/wikipedia_random_article.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef417791-32d7-4051-8e7a-1d088c1a40b7/harry_potter_6_scholastic.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd01056a371610b8780aab/1606222086168/4146849352.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEE 5540 bytes
SHA-256: e1c1d76e6373c961bc32fc403d51db6e99efbe3c2c55a8f18e2e2dd77824ef2a
font_01_sfnt_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 11664 bytes
SHA-256: 9fa2cbffe5cb17c27eebf71a0d8127286337012832f7a8ff1fe42693a2820127
font_02_sfnt_off00010528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 16104 bytes
SHA-256: d2703eec0843ee934b0a8bba7850da2550094fb4af61d17619ccbf35009047d2

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