Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e35a3121e47d3d…

MALICIOUS

PDF

41.9 KB Created: 2020-10-13 08:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d4ebd763b44ba0a005f12bd173d22140 SHA-1: 2c6a6e1968637368ebac614f8a81a37fda8387cb SHA-256: 76e35a3121e47d3db71097f4ada6330a1624f261fd626194ef7f5d7e50029b79
162 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, many hosted on strikinglycdn.com, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/strik. The document body, though heavily obfuscated, contains text related to 'Oswaal question bank class 12 pdf download' and the malicious URL, indicating a lure to trick users into clicking malicious links. No scripts were extracted, but the presence of multiple external links and the malicious redirector points to a distribution or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=oswaal+question+bank+class+12+pdf+download In PDF document text
    • http://files.tuttabellaphotography.co.uk/uploads/1/3/1/4/131410434/75757126e5.pdfIn 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://uploads.strikinglycdn.com/files/a71ccf83-32ff-4c83-8631-b987bea943d3/lapawenosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da92cc83-72db-4511-953c-44c2815d58a6/92617309180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c62f989-3a86-40fa-a4b4-cfdda5733306/xozasopawekonuvugibetib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ef26e8d-2682-477b-8ba7-a039051b7fe8/gemukabevipij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd04f79e-c596-467b-9954-f4c62299f527/14487834862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e34e30f-0ebf-488e-9cd4-5cb5f1e42e46/12310313785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0b22bdb-2b07-4889-8aaa-6da408e8a88d/2021487664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bbc2097-bf62-42cb-be8d-885e2bd59df3/kaginurugeva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3075/4966/files/zukekupagekunituni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7290/0264/files/56691330210.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3280/8088/files/dave_ramsey_drive.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/0360/1049/files/wanukuxupojogefub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2335/4021/files/peruvian_apple_cactus_growth_rate.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_off00005536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5536 5568 bytes
SHA-256: 6103b87e4dc75ca637b74b3bed2d1ff8cc879e53f8a8dc75acfa4e0518e1290d
font_01_sfnt_off0000684d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x684D 10608 bytes
SHA-256: 178fc8cc42a7dd3ad5124b49f8fbdd44f9a47069dd6283362b90e5ab47f9208a
font_02_sfnt_off00008c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C69 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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