Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b8dc1dbd071bb3…

MALICIOUS

PDF

59.5 KB Created: 2020-08-30 13:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6dd6d55509c14444ccd75da1e4b189a SHA-1: 8afa915815b7291a53466d2e549c35d7bb477b36 SHA-256: d3b8dc1dbd071bb3af1364184850a8435edc1fe0070f8b6e217ff16ac1452907
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=horror+movie+riddles'. The document body, though heavily obfuscated, also contains this URL. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious links broadly.

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://ttraff.ru/wix?keyword=horror+movie+riddles
    • https://cdn.shopify.com/s/files/1/0440/5254/5701/files/20636285270.pdf
    • https://cdn.shopify.com/s/files/1/0435/9038/5821/files/electrician_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/7510/7992/files/automobile_engineering_book.pdf
    • https://static.usrfiles.com/ugd/b8c837_d68c0965a14c4a3083f3c9f0077d06fc.pdf
    • https://static.usrfiles.com/ugd/4dd980_1f5e883a8bd24e2bbe8cd41eb6cdd8cb.pdf
    • https://cdn.shopify.com/s/files/1/0431/7518/2485/files/50889151385.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/zetojopojarijijunenid.pdf
    • https://cdn.shopify.com/s/files/1/0429/9443/4207/files/rebanulorebebalazu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2201/4870/files/cbse_class_10_science_question_paper_2020_aglasem.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5183/files/caterpillar_3516_operation_and_maintenance_manual.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aed5.bin
6bf91b0d08e5907a83aa21694cbc44bbb70d769b26d5935239e0bf7988fa8dea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAED5 4784 bytes
font_01_sfnt_off0000befc.bin
27b2af26a2ea0cb596492dfb18901dd9e9405fd30b85d7714e17942e140c9281		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFC 10120 bytes

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