Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f2d287e6cdb1bdc…

MALICIOUS

PDF

41.6 KB Created: 2020-08-06 21:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f107d7fba9a328c7e07736997f27e224 SHA-1: c0c67582aea088d64533b8de77bd18c9b95d1486 SHA-256: 1f2d287e6cdb1bdc7eddc5fd27e780fa7709df67416166c8e9173b3a0a0aed5e
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to 'Grammar for English Language Teachers 2020 PDF', likely intended to trick users into clicking the malicious link. The presence of multiple Shopify-hosted PDF links suggests a link farm or SEO poisoning tactic to distribute the malicious PDF.

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=grammar+for+english+language+teachers+2020+pdf
    • http://files.thutupallilab.com/uploads/1/3/0/7/130739169/6eac41cf04429f6.pdf
    • http://files.hillcrestsdachurch.co.nz/uploads/1/3/0/7/130739298/2753048.pdf
    • http://files.midwestmozart.org/uploads/1/3/1/4/131406892/zotom-lufikogefa-dadulan.pdf
    • http://files.efabps-opportunitygaps.org/uploads/1/3/2/6/132682882/3917729.pdf
    • https://cdn.shopify.com/s/files/1/0432/6404/9318/files/caesar_cipher_in_cryptography.pdf
    • https://cdn.shopify.com/s/files/1/0431/6292/7253/files/mowepedimenozatikilonu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7045/5965/files/13852583075.pdf
    • https://cdn.shopify.com/s/files/1/0430/2051/7537/files/sop_abortus_imminens.pdf
    • https://cdn.shopify.com/s/files/1/0434/5567/6568/files/40705164082.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/45869709466.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0845/files/sujedijimadobomimoxexi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9363/8816/files/vozokinejamuvolamituw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/describe_people_s_appearance_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/6968/5414/files/forest_biometric.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/fundamentals_of_analytical_chemistry_8th_edition.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_off00005668.bin
4825f22c6c7c8d7d18730fc09071dd99c14d68fe9e3ca74a51950ee7d8be13b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5668 5756 bytes
font_01_sfnt_off000069d4.bin
cb4d29c162e42f132b4e9a75b5a2c0fceee288663defe1a6a8ef9896346447dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69D4 9852 bytes
font_02_sfnt_off00008b75.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B75 4324 bytes

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