Malicious PDF — malware analysis report

Static analysis result for SHA-256 00200f908db3fa70…

MALICIOUS

PDF

36.3 KB Created: 2020-08-21 09:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7d623fd06755e21bb2a1c7f71c27858 SHA-1: ea2ad4b8f7461fcdd0f5853afb199b0b10dbd843 SHA-256: 00200f908db3fa70640467f7bafecc4d83287670de436c3b8db586efec70df81
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru', which is associated with SEO link farms. The document body also contains the same keyword, suggesting a lure. The presence of numerous embedded links, many pointing to benign Shopify URLs but also including unknown ones, indicates a potential attempt to manipulate search rankings or redirect users to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=cafeland+cheat+engine+free
    • http://files.geteffect.net/uploads/1/3/0/8/130873717/6628571.pdf
    • http://files.rjcmgt.com/uploads/1/3/0/7/130738700/fenutumifekun-petafekipiwut.pdf
    • http://files.windmillgsd.com/uploads/1/3/0/7/130739343/negonipaxigo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5306/3063/files/30_team_single_elimination_bracket.pdf
    • https://cdn.shopify.com/s/files/1/0427/7937/7830/files/botany_scientific_names.pdf
    • https://cdn.shopify.com/s/files/1/0434/4188/1253/files/el_budismo_zen.pdf
    • https://cdn.shopify.com/s/files/1/0432/7378/1408/files/77583194319.pdf
    • https://cdn.shopify.com/s/files/1/0434/8307/0629/files/printable_2020_calendar_by_month.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7992/files/39846610432.pdf
    • https://cdn.shopify.com/s/files/1/0440/1224/1046/files/kaviv.pdf
    • https://cdn.shopify.com/s/files/1/0437/6104/1559/files/ukulele_fingerpicking.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1349/files/taximotabibu.pdf
    • https://cdn.shopify.com/s/files/1/0446/8460/7641/files/pneumonia_guideline_2018.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/1490936185.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_off00004c62.bin
bdf9593c6e135bb5fe7fe1f5574c81519c2ed566003b37200786c6170961eb55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C62 5008 bytes
font_01_sfnt_off00005d64.bin
549dbbd08b6b48bc1c1aae36f87620bb8e19ee119d8b7b189777b62d67ea9f71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D64 12908 bytes

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