Malicious PDF — malware analysis report

Static analysis result for SHA-256 76577d3b2c837d35…

MALICIOUS

PDF

45.4 KB Created: 2020-08-14 20:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9526e5e0afc74403d023037ff9ec0014 SHA-1: ad6597e72e0bdcb3f42412e2a6b19ce9f17fcd6f SHA-256: 76577d3b2c837d3553fae76e329b7b148b6161f1d7f082d060de135d48d5d9d1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/wb?keyword=atomberg%20fan%20remote%20manual'. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is designed to redirect users to 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/wb?keyword=atomberg%20fan%20remote%20manual
    • http://lamik.drama.shenfieldlearning.com/uploads/1/3/1/6/131636664/xojakaf-gerefivojudub-piwotuxigesed.pdf
    • http://files.nicolecudzilophotography.com/uploads/1/3/1/3/131381881/4410718.pdf
    • http://files.africaeuyouthlab.org/uploads/1/3/1/3/131384306/280ab.pdf
    • http://fetojenin.putaboogonit.com/uploads/1/3/1/6/131636725/995b316b184de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0130/6526/files/ragulapijoxazakewuf.pdf
    • https://cdn.shopify.com/s/files/1/0440/9029/4437/files/piketider.pdf
    • https://cdn.shopify.com/s/files/1/0431/5545/6164/files/91185426550.pdf
    • https://cdn.shopify.com/s/files/1/0430/3850/7169/files/19395747695.pdf
    • https://cdn.shopify.com/s/files/1/0428/0667/3574/files/index_of_vampire_diaries.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/javapolibetabaxixu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7446/7478/files/sample_blotter_report.pdf
    • https://cdn.shopify.com/s/files/1/0440/5559/3110/files/zironokowudokubunabu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/wetonefon.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f3b.bin
6c2184b6672cf02eb5c2c9a4b63c6be06566a1a7ef9368d9ea8fc6360aa260cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3B 5036 bytes
font_01_sfnt_off0000704f.bin
bc84678ffa3d4d51d84f3b973369947d04bda53276931fc8cbbd5d9de6d5d0c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x704F 10288 bytes
font_02_sfnt_off0000939c.bin
5dc9ed390f12ed626cc6b7d34b48072e742e77445905164704ef3766ecb6c898		 pdf-font-stream PDF embedded font (sfnt) at offset 0x939C 16164 bytes

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