Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba91d4e6d21b625…

MALICIOUS

PDF

45.0 KB Created: 2020-08-05 04:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 996ac86d8a06da8542d6bf04fbc26bda SHA-1: 640503d88062d2832aaa599f81628b4a93bccf3e SHA-256: bba91d4e6d21b625bbdba7b702739e45d070691f02fcc96047aea5a83601ec10
150 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with a critical heuristic identifying a redirector link to ttraff.ru. The document body, though heavily obfuscated, also contains this URL, suggesting it is a primary lure. The presence of many SEO-like PDF links indicates a link farm strategy, likely to obscure the malicious redirector. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=cerebellar+examination+pdf
    • http://files.transcend-ed.com/uploads/1/3/0/9/130968926/turir-dekabojov-jexiv-rexajuxe.pdf
    • http://files.allmetalcornerguards.com/uploads/1/3/1/4/131437977/5540224.pdf
    • http://files.lolaca.com/uploads/1/3/0/7/130738765/3048349.pdf
    • http://files.flipsidetoo.com/uploads/1/3/1/4/131454459/zabenogafiga-nujaxujamel-zajot.pdf
    • http://finegolam.perksautospa.net/uploads/1/3/0/7/130775320/murunuga-lafako-sutuvava-sisagududo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9306/5877/files/zobapegogulesozififu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2590/7368/files/xugakunegisagofinugiga.pdf
    • https://cdn.shopify.com/s/files/1/0434/2788/9302/files/rapumugemime.pdf
    • https://cdn.shopify.com/s/files/1/0440/0663/7726/files/maperifuxazokejibuwu.pdf
    • https://cdn.shopify.com/s/files/1/0439/0119/0299/files/godabovufuti.pdf
    • https://cdn.shopify.com/s/files/1/0429/4787/0876/files/vorizeravigamixapomozufu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5526/7496/files/58441547931.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2967/files/gonitejobufalitofeviz.pdf
    • https://cdn.shopify.com/s/files/1/0430/5282/6773/files/52743907628.pdf
    • https://cdn.shopify.com/s/files/1/0440/1060/2661/files/generac_generator_won_t_start.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_off0000758a.bin
9bdd8ab3e32411a0192b9815f0680341c902fdf878cb066917ebeea0412ff0ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x758A 5124 bytes
font_01_sfnt_off000086dc.bin
e69b9d5c76ba811b5337338de9297e07695aef35853a0f7d4b94b0f0233ad480		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86DC 9568 bytes

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