Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc6160eaf83c12e…

MALICIOUS

PDF

40.3 KB Created: 2020-08-03 20:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 016780cc14cab02afe2150878bab861c SHA-1: fba073e351a4fdff417bee5981cfb51d93027e80 SHA-256: 8fc6160eaf83c12e4dd4f778477a11996d7e4f81d94b29e7394b3ccba7b4d5c6
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a technique often used in SEO link farms to manipulate search engine rankings or distribute malicious content. One of the primary links, 'https://ttraff.com/wb?keyword=cornell%20notes%20avid%20pdf', is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. 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.com/wb?keyword=cornell%20notes%20avid%20pdf
    • http://files.aloe-arborescensshop.eu/uploads/1/3/2/6/132680796/309560.pdf
    • http://files.sbtcandles.com/uploads/1/3/0/7/130775918/venanet.pdf
    • http://files.westtechmobile.com/uploads/1/3/1/4/131406412/4587864.pdf
    • http://files.vibrantlife101.com/uploads/1/3/0/8/130813400/7ebbc9632f0c0d.pdf
    • http://files.ellismedlibrary.org/uploads/1/3/1/1/131164314/dasirajipubule.pdf
    • https://cdn.shopify.com/s/files/1/0432/2564/5211/files/56719677145.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/badarifokaporizuja.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/relonaluxew.pdf
    • https://cdn.shopify.com/s/files/1/0430/7045/5965/files/nujuzereza.pdf
    • https://cdn.shopify.com/s/files/1/0432/5736/4638/files/mac_os_spigot.pdf
    • https://cdn.shopify.com/s/files/1/0432/0958/8897/files/pibunowolez.pdf
    • https://cdn.shopify.com/s/files/1/0431/2150/8509/files/zupixavatasedite.pdf
    • https://cdn.shopify.com/s/files/1/0435/8370/1151/files/59385611933.pdf
    • https://cdn.shopify.com/s/files/1/0429/1624/9767/files/vetiwagizibosomizeleg.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/dusolukasex.pdf
    • https://cdn.shopify.com/s/files/1/0435/3913/6661/files/sebotoratomu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8198/0321/files/neopets_reddit_food_club.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_off00006062.bin
27697dc46c0527946b3525cc98b4727102eca17f94156ad022ed657ec18341e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6062 5000 bytes
font_01_sfnt_off00007174.bin
042e63964c3819f0896c0ce86c6cb1cccc7efa0e44196cd518ff621cc5c2075e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7174 10208 bytes

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