Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fe5e26912fc4ff3…

MALICIOUS

PDF

37.0 KB Created: 2020-08-08 10:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40f66da8e67f8e6582922fa81a429076 SHA-1: e4ba466d5d15d1917fce52d6379fff05fffd047c SHA-256: 0fe5e26912fc4ff3c12321f6ad3d57df8be461fa7967dc7224265bda0bbeeddd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or redirection strategy. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is used to obscure the final destination. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=amazing+grace+violin+sheet+music+pdf, indicating the lure used to entice users to click on malicious links.

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/pify?keyword=amazing+grace+violin+sheet+music+pdf
    • http://rodewik.xavierlecouturiermusic.com/uploads/1/3/0/7/130775085/mibafasufenumif-jaferepozemit-jokakixo-motijiwofeji.pdf
    • http://files.buckeyevizslarescue.org/uploads/1/3/1/6/131606431/69b7f5c6.pdf
    • http://files.stephencoetzee.co.uk/uploads/1/3/1/3/131383651/cf87f006414.pdf
    • http://files.girlranawayshop.com/uploads/1/3/1/8/131872273/kizawoniwam-lifalekelolur-kudaxipazovu-bidudalofi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0180/6997/files/bixupapuda.pdf
    • https://cdn.shopify.com/s/files/1/0433/5455/4533/files/reading_and_writing_k12_deped.pdf
    • https://cdn.shopify.com/s/files/1/0429/4311/9516/files/28566698125.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/73763811753.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/65810522513.pdf
    • https://cdn.shopify.com/s/files/1/0435/2425/9992/files/zomatituviloba.pdf
    • https://cdn.shopify.com/s/files/1/0440/0083/7782/files/35300847602.pdf
    • https://cdn.shopify.com/s/files/1/0432/2577/6288/files/south_bend_9_lathe_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/7103/6835/files/35862256872.pdf
    • https://cdn.shopify.com/s/files/1/0437/8905/8206/files/auditing_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/6031/3768/files/bexiga.pdf
    • https://cdn.shopify.com/s/files/1/0434/9798/0056/files/gemuratupukazaliwuvov.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3541/files/nelazezeloluzoxupemeli.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051bd.bin
327406a30bbde39ea1992dda26ebe398c1948198b012c14a2c16cf9f8634239f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51BD 5668 bytes
font_01_sfnt_off000064e8.bin
77bc73c9ff093e92df69a3d18c64526e53a44a82e55d254a59bde2c9e505927b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E8 9808 bytes

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