Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3589d0225024b6b…

MALICIOUS

PDF

54.3 KB Created: 2020-08-09 06:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da8bba92311273efd5aca8c158270f4c SHA-1: b66c23768c3e7c75c53eb60e879d9c7f398831ce SHA-256: a3589d0225024b6bb45b92e0f2d0ade3d81a50de8c913b9aa92afa03d8b0818c
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=introduction+to+mathematics+book+pdf'. Another critical heuristic identified a large PDF link farm, with the dominant host being 'cdn.shopify.com'. The document body contains garbled text but includes the same redirector URL and several Shopify URLs, suggesting a coordinated effort to distribute malicious content or phishing lures through SEO poisoning tactics.

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=introduction+to+mathematics+book+pdf
    • http://tofededev.karasbakeshoppe.com/uploads/1/3/2/8/132814930/3427494.pdf
    • http://files.kelseyjenkinson.com/uploads/1/3/1/4/131438056/776a7a9bda.pdf
    • http://files.sprucetopsmn.com/uploads/1/3/2/6/132682239/7656712.pdf
    • http://files.mrpsocialstudies.com/uploads/1/3/2/6/132696112/3623965.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/amen_ra_s_age_inhibition_regimen_air.pdf
    • https://cdn.shopify.com/s/files/1/0438/9843/7784/files/waropusekumokarazexe.pdf
    • https://cdn.shopify.com/s/files/1/0436/8472/4889/files/wordly_wise_3000_book_7_lesson_20.pdf
    • https://cdn.shopify.com/s/files/1/0433/4511/7342/files/nitoma.pdf
    • https://cdn.shopify.com/s/files/1/0428/2066/5510/files/job_application_cv_format.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/21617339932.pdf
    • https://cdn.shopify.com/s/files/1/0430/1222/7225/files/xowifigedubesotiwikakusa.pdf
    • https://cdn.shopify.com/s/files/1/0434/3493/4429/files/wetupe.pdf
    • https://cdn.shopify.com/s/files/1/0435/8674/8579/files/jukazejokulop.pdf
    • https://cdn.shopify.com/s/files/1/0430/9870/1977/files/vogitedofidejesitu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a77.bin
2fa5d1aaf0474914e018795353c2839dcab7c082cc2d6cf3e1ee592642a3dfbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A77 13008 bytes
font_01_sfnt_off00009464.bin
9ff0bb1101109dab63a2515766a74dbe486ac4d6bc10c4959de1449fda9c2fa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9464 5504 bytes
font_02_sfnt_off0000a6e7.bin
3ae5401dd529b0ba37d16daed0c617cb004a9c25b4cec6c18b7f23e76650a4d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6E7 10912 bytes

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