Malicious PDF — malware analysis report

Static analysis result for SHA-256 6253cbe8e1ac6183…

MALICIOUS

PDF

41.8 KB Created: 2020-08-25 14:39:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b04489155b0b41cc87177ace67a2a8c SHA-1: 3e358d71ca38a229ebd39721e1a2c5717ef4a328 SHA-256: 6253cbe8e1ac6183cc369613cd93a25a34d693921a59cf62a65317a04412c6fa
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious content. The document also contains a large number of links to other PDFs hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs confirms the intent to redirect users to potentially harmful sites.

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=django+template+variable+not+set
    • http://nuniba.oakcreekcounseling.org/uploads/1/3/0/7/130776106/97cd007.pdf
    • http://files.busiwerks.com/uploads/1/3/1/4/131453146/df7edf6.pdf
    • http://dupinewi.axumagri.org/uploads/1/3/1/3/131380005/fidizupomujar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0444/5110/2887/files/atlas_10_lathe_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2625/9876/files/14834571146.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4467/files/89669068332.pdf
    • https://cdn.shopify.com/s/files/1/0436/1335/6189/files/chicago_manual_of_style_bibliography_generator.pdf
    • https://cdn.shopify.com/s/files/1/0429/9997/1999/files/32192957745.pdf
    • https://cdn.shopify.com/s/files/1/0430/9244/3303/files/cartesian_form_equation.pdf
    • https://cdn.shopify.com/s/files/1/0429/1418/5372/files/8749806471.pdf
    • https://cdn.shopify.com/s/files/1/0446/9637/1356/files/beginner_piano_sheet_music_pop_songs.pdf
    • https://cdn.shopify.com/s/files/1/0434/5643/0230/files/29532783022.pdf
    • https://cdn.shopify.com/s/files/1/0431/8311/2341/files/past_perfect_active_and_passive_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0436/2751/1961/files/jimev.pdf
    • https://cdn.shopify.com/s/files/1/0427/7947/6134/files/98372108161.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/bootstrap_grid_template_code.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_off00006346.bin
a4e0e25b803a7a11a94a13ad025a3b3866a10aea609fcaa61dacd32a0d741f78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6346 5416 bytes
font_01_sfnt_off000075a6.bin
9cf4cfea342e1dc5b9e3fd274d481097ff2bcfae13967dcea3aaed9aa851dc33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75A6 10752 bytes

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