Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13b32cf5472dbde…

MALICIOUS

PDF

42.8 KB Created: 2020-10-02 09:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bc8ed6d5adfdf11d66323e9727892d5a SHA-1: 14b7c83ff36dd03ada2d909c6dec2e6b4f7783cf SHA-256: b13b32cf5472dbde9a6519a54e8ec0047c161cc970d8fe695441b1fbf92c1ccb
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm, directing users to potentially malicious or SEO-spam related websites. One critical heuristic indicates a direct link to known malicious redirector infrastructure. The document body, though partially garbled, suggests a lure related to English grammar exercises, which is a common tactic 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://cctraff.ru/strik?keyword=englisch+simple+past+past+perfect+%25C3%25BCbungen+pdf In PDF document text
    • http://bedexut.teamcherwell.org/uploads/1/3/1/4/131453943/118668.pdfIn PDF document text
    • http://bineno.walkingwithieke.com/uploads/1/3/0/8/130814328/pedutezozifoduvusapa.pdfIn PDF document text
    • http://files.alpinelegendspixiebobs.com/uploads/1/3/0/7/130776795/lekonuvuborod.pdfIn PDF document text
    • http://files.drsusankentarce.com/uploads/1/3/1/4/131453464/lulijesex.pdfIn PDF document text
    • http://vujada.wordslikestars.com/uploads/1/3/1/8/131856723/subibugop.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/6db37514-a095-4bd5-a741-523684dec5a2/donivunedijega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/955ec66a-a7bc-4c7c-ae76-cec29f3bd1e0/roregivasumixofukalojav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c04bf645-6b45-454d-a566-bfcd44e88775/tifup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ae2c72-2f02-4b86-a49d-9dbf40905d3f/33013589197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b78eacad-2348-4c36-9b12-190ae30372ba/47257735829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d88ff68-226b-4337-83c2-71ba2a41228d/5698241274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09215f9d-9630-4994-8f8b-63fe0eac26fc/kugesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d70d2bdc-9da6-4288-88a2-f2a2419a5500/naduvekexojibepobalev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5584466-6fc7-4004-a04a-1789769da5ca/73255619894.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7791/7079/files/88280855121.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6972/5082/files/el_arte_nuevo_de_hacer_comedias_cervantes_virtual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1060/5735/files/newport_news_catalog.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_off00005159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5159 5784 bytes
SHA-256: 90c54ab0870e05c27aeaaa74bc4853373904a0e6423ebac18314683b301e90c1
font_01_sfnt_off000064a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64A8 10276 bytes
SHA-256: eb379ce049336535bc89f5400a20ced7bed9d7f31a08475b2e07280bff2e4bf3
font_02_sfnt_off000086c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86C2 16088 bytes
SHA-256: fff8b70d67420864e2a263fdbbaad35efae781e73a516d3cf38207748e8715b5

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