Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f93a2d13fabb50…

MALICIOUS

PDF

41.4 KB Created: 2020-08-13 22:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c053b5c07f98796f9c2f05d7efb2b447 SHA-1: e1bb41ef9b4622ebb403a55b70a7b3184a5a4bf3 SHA-256: 86f93a2d13fabb504d7bf8a987c11b3482ff9ca2d6dfc8133ad1ff9475d38a60
150 Risk Score

Malware Insights

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

The PDF document was flagged by a critical heuristic for containing a malicious redirector link and a mass external PDF link farm. The ML classifier also strongly indicated maliciousness. The embedded URL 'https://ttraff.cc/pify?keyword=zen+alarm+clock+sound' is a clear indicator of a malicious redirector. The document body, though heavily obfuscated, contains this URL and other PDF links, suggesting a lure to external malicious content.

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.cc/pify?keyword=zen+alarm+clock+sound
    • http://files.rfid-off.com/uploads/1/3/0/8/130813866/9247936.pdf
    • http://temoxegu.bkhouse.services/uploads/1/3/0/9/130969204/pidizawika_rokejut_pofoxa_rigixu.pdf
    • http://diber.okiobi.com/uploads/1/3/1/1/131164278/1321128.pdf
    • http://zebobi.chasingourmemoriesgeneralstore.com/uploads/1/3/1/3/131380600/4121720.pdf
    • http://files.cinsationaljenn.com/uploads/1/3/0/8/130874317/mimil_nomoxeg.pdf
    • https://cdn.shopify.com/s/files/1/0436/9121/2950/files/77651545915.pdf
    • https://cdn.shopify.com/s/files/1/0433/1077/6478/files/dell_deminsion_2350.pdf
    • https://cdn.shopify.com/s/files/1/0435/6423/6968/files/cannon_power_shot_s2is.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3768/files/sidofegipuzavazimurude.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/24633679908.pdf
    • https://cdn.shopify.com/s/files/1/0429/2847/2220/files/88623727813.pdf
    • https://cdn.shopify.com/s/files/1/0433/2804/5209/files/zuwogakudotozelakezek.pdf
    • https://cdn.shopify.com/s/files/1/0429/7592/0282/files/36722625137.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4033/files/bofatuwulubitu.pdf
    • https://cdn.shopify.com/s/files/1/0427/5660/4070/files/advertising_promotion_and_new_media.pdf
    • https://cdn.shopify.com/s/files/1/0433/3423/8362/files/1915871414.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_off00006518.bin
76a1e316ccf7cd3720cd3bf7d264cbd71c25fd761ac37d76ab04139a80d922d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6518 5108 bytes
font_01_sfnt_off00007658.bin
d76fb6e5598963e52ead885f87091428482b53f92428e9ba614b60dbf51d6023		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7658 10156 bytes

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