Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf48315ad7831b69…

MALICIOUS

PDF

40.5 KB Created: 2020-08-05 04:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1474c54b2ba0a57abbe1a0f49b9e5767 SHA-1: 1fe915dd4cd4d1a4d00bf25b22527bba8f9a0eb6 SHA-256: bf48315ad7831b691e865834a93cabfb6a7e3bf80bf5ff68c51210529649c370
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious payload. The document body itself is largely obfuscated but contains the same URL, suggesting a lure to download further content. The presence of numerous external PDF links, many pointing to Shopify, indicates a link farm strategy to improve search engine ranking for the malicious content.

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=ai+ay+a+e+worksheets+pdf
    • http://files.scituatehighschoolathletics.com/uploads/1/3/1/0/131071256/wuxoxazux.pdf
    • http://files.zhuangguo94.com/uploads/1/3/1/3/131383314/aeba07193.pdf
    • http://files.monicamacansantos.com/uploads/1/3/0/8/130814515/vojiwipenexotoso.pdf
    • http://files.thehazelhut.com/uploads/1/3/0/8/130813639/femapenirijesugi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0389/4171/files/59177297465.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/78757295321.pdf
    • https://cdn.shopify.com/s/files/1/0436/3635/9326/files/44704343685.pdf
    • https://cdn.shopify.com/s/files/1/0431/8317/7885/files/34149338959.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuwotowomezi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0183/8744/files/26231146152.pdf
    • https://cdn.shopify.com/s/files/1/0438/9535/7595/files/cadweld_one_shot.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/tj_maxx_job_application.pdf
    • https://cdn.shopify.com/s/files/1/0436/4677/9552/files/dodesiwarazovokutuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0679/files/27993791397.pdf
    • https://cdn.shopify.com/s/files/1/0432/2597/2904/files/flash_powder_wow_classic.pdf
    • https://cdn.shopify.com/s/files/1/0437/1896/7450/files/auto_tune_vst.pdf
    • https://cdn.shopify.com/s/files/1/0431/2530/9604/files/vexukofeni.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004aee.bin
af1aba81041f247076001ba407e999d570412959d42e34e5fa65ccf62e88e0bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AEE 5344 bytes
font_01_sfnt_off00005d2f.bin
34cb47553d09ea90254d9b47873dc6fde8d58b53efa32074ad38a52c758797cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2F 9940 bytes
font_02_sfnt_off00007f5b.bin
aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F5B 16312 bytes

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