Malicious PDF — malware analysis report

Static analysis result for SHA-256 5afbe71f44a9b76c…

MALICIOUS

PDF

44.6 KB Created: 2020-08-16 22:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1a70cc5ec415747536a7b7d720bb33a SHA-1: 0d073f518bae6aa300e99ffd6f1113f87258a443 SHA-256: 5afbe71f44a9b76c026a7f360896dbd00b522902a079ffbe266fa38431cef269
162 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One prominent link, 'https://ttraff.ru/pify?keyword=brooklyn+99+6+temporada++mp4', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to lure users to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=brooklyn+99+6+temporada++mp4
    • http://files.goodtimesgv.com/uploads/1/3/0/7/130775191/3bcb9.pdf
    • http://files.luciearcher.com/uploads/1/3/0/7/130775328/4ee2aa75470.pdf
    • http://files.charmedbordercollies.com/uploads/1/3/1/4/131453355/jidetutopu-pogujem-vawizusomir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/8344/7968/files/87607688876.pdf
    • https://cdn.shopify.com/s/files/1/0432/5156/4707/files/tuxizikezuxulutuvike.pdf
    • https://cdn.shopify.com/s/files/1/0438/3598/1974/files/dunegiravuzuva.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/gituv.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/kuwuzalokimeb.pdf
    • https://cdn.shopify.com/s/files/1/0429/2149/2643/files/taxation_and_land_reform_in_the_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0427/6230/5702/files/rewimolatelivosobiku.pdf
    • https://cdn.shopify.com/s/files/1/0453/9233/0920/files/kashmir_banega_pakistan_logo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4555/1271/files/sustainable_construction_green_building_design_and_delivery_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/7605/0330/files/fuzavajajugopun.pdf
    • https://cdn.shopify.com/s/files/1/0431/2222/9397/files/kavovivevunizosamizamasem.pdf
    • https://cdn.shopify.com/s/files/1/0432/7804/1244/files/fotewu.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_off0000638b.bin
594d238e161942559d44098730c5825df4e0622f99735853baaad409f6578c06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x638B 5280 bytes
font_01_sfnt_off00007570.bin
185c55831da34854e9e9bcd8267bad41de17311ed7d09ed7ae91482ecbdee0c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7570 9992 bytes
font_02_sfnt_off000097a0.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97A0 4324 bytes

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