Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a524c3646273f0c…

MALICIOUS

PDF

45.2 KB Created: 2020-08-04 00:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22c1bb532011c92b86c2423b037dfbee SHA-1: a8530f18dab72e816378aec2370b63ab05a350db SHA-256: 6a524c3646273f0c48ce58da5bf09d42126a8f236c8833b5b449656b4e488c88
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which likely serves as the initial lure. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. No scripts were extracted, but the presence of embedded URLs and the redirector link strongly suggest a phishing or redirection attempt.

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=pronunciation+problems+in+english+pdf
    • http://files.ambleon.net/uploads/1/3/1/0/131070125/zulalusimutolosu.pdf
    • http://files.euacademycs.org/uploads/1/3/1/0/131070351/4581610.pdf
    • http://files.karenpikedesigns.com/uploads/1/3/2/8/132815806/2528812.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/9587/6003/files/6523853772.pdf
    • https://cdn.shopify.com/s/files/1/0429/0609/1687/files/85954124812.pdf
    • https://cdn.shopify.com/s/files/1/0439/9644/6878/files/html_game_codes_copy_and_paste.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7660/files/29694230159.pdf
    • https://cdn.shopify.com/s/files/1/0440/7577/8198/files/zill_differential_equations_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/7248/6564/files/52336639554.pdf
    • https://cdn.shopify.com/s/files/1/0430/2172/9955/files/bosuliganowojafa.pdf
    • https://cdn.shopify.com/s/files/1/0436/9124/5733/files/33222338521.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/fedopixugomorusujeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/7473/1685/files/medenerota.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dedagefegumam.pdf
    • https://cdn.shopify.com/s/files/1/0438/6462/1211/files/segoe_ui_web_font.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006338.bin
6a424c08f8fd285d538c60580dd4b088d4ef0e75d5cba6a47aec4d21e2f4b6c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6338 5592 bytes
font_01_sfnt_off000075fc.bin
eec6956c9917fc30750d68265d16c1f166d482de75b6aeaa16149472f100c619		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75FC 10456 bytes
font_02_sfnt_off0000998f.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x998F 4324 bytes

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