Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c8b6937ab6b667…

MALICIOUS

PDF

50.4 KB Created: 2020-08-30 19:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15796dd91cba2a59271021f4545c3702 SHA-1: 221c7889c61e09d6858699b2377baa391370e93d SHA-256: 22c8b6937ab6b667b64a69549c3b44116ca2f5b8c4c1a09e8577264e2e34b30a
152 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.ru'. Additionally, it exhibits a PDF link farm with numerous links to Shopify-hosted PDFs, suggesting a coordinated effort to distribute content or manipulate search results. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious activity.

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/wix?keyword=knx+1070+on+air+personalities
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/wunutisevetogiworovet.pdf
    • https://cdn.shopify.com/s/files/1/0434/6596/5718/files/81144018766.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1413/files/ffxv_guide_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/4853/3142/files/75668904813.pdf
    • https://cdn.shopify.com/s/files/1/0431/8491/4583/files/45801009510.pdf
    • https://cdn.shopify.com/s/files/1/0432/1103/0683/files/16007550474.pdf
    • https://cdn.shopify.com/s/files/1/0432/9462/1862/files/conventional_agriculture_definition.pdf
    • https://cdn.shopify.com/s/files/1/0437/0091/2278/files/91575170600.pdf
    • https://cdn.shopify.com/s/files/1/0437/5265/2951/files/vipimuko.pdf
    • https://static.usrfiles.com/ugd/b8c837_22a7c7319b0e456a8a00843f11f10d95.pdf
    • https://static.usrfiles.com/ugd/837d34_11393d6c8dc14b48bda92d06b4c75611.pdf
    • https://static.usrfiles.com/ugd/b8c837_eed5214769894018ade179f2bcb6e221.pdf
    • https://static.usrfiles.com/ugd/be19e1_9a5ccff8164c4a59a3b2ff827887304c.pdf
    • https://cdn.shopify.com/s/files/1/0431/2471/9773/files/57859962448.pdf
    • https://cdn.shopify.com/s/files/1/0437/5724/0478/files/pixakiki.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6331/files/lizatesadexojomexatu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6038/files/29356065827.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000087a9.bin
5b95a85c206a147bb262a1878c0e75b5b58095d4a35dc472f3d282872c2cd4ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87A9 5124 bytes
font_01_sfnt_off00009929.bin
c2520af2e076432899d4af9af508571f23e76aab6a2085eb0d7336f38267390f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9929 10380 bytes

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