Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42bfe6aa21f7c30…

MALICIOUS

PDF

46.6 KB Created: 2020-07-30 12:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10d91736dca5826545f66689c90900b1 SHA-1: 38ae3385681720c949bffa34bb16c66c64488ba7 SHA-256: c42bfe6aa21f7c306af13ff5c78609ea39ec2fc6996a7ddbecb4c4e81f074dc1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links that point to a known malicious redirector (ttraff.ru). The document body, though heavily obfuscated, contains text related to 'American college of rheumatology rheumatoid arthritis pdf', suggesting a lure to disguise the malicious intent. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK strongly indicates the document's purpose is to redirect users to harmful content. The ML classifier also flagged this PDF with high confidence.

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=american+college+of+rheumatology+rheumatoid+arthritis+pdf
    • http://files.morethansoulfood.net/uploads/1/3/2/3/132302973/timuf.pdf
    • http://files.saintalphonsusschool.org/uploads/1/3/1/8/131857071/b41fba5.pdf
    • http://files.lighthouseministryintl.org/uploads/1/3/1/6/131637714/nelozivetizogoti.pdf
    • http://files.marcoaltini.com/uploads/1/3/1/4/131438003/4440901.pdf
    • http://files.eihqguild.com/uploads/1/3/0/8/130874125/tokubexa_wesane_dufemipa.pdf
    • https://cdn.shopify.com/s/files/1/0435/0659/8040/files/70524494589.pdf
    • https://cdn.shopify.com/s/files/1/0435/1718/2104/files/75476339420.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8913/files/51741454668.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9658/files/30144276289.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/konedodalaguxitivog.pdf
    • https://cdn.shopify.com/s/files/1/0430/5800/4117/files/tagomojoteg.pdf
    • https://cdn.shopify.com/s/files/1/0428/9452/4579/files/wovenazapet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0258/4480/files/bazibulozanavedelin.pdf
    • https://cdn.shopify.com/s/files/1/0437/2371/8805/files/29091965319.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/75565257125.pdf
    • https://cdn.shopify.com/s/files/1/0429/0756/6239/files/9022938563.pdf
    • https://cdn.shopify.com/s/files/1/0430/2523/6121/files/kakaxevezorakevo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1240/7967/files/ditufanimakuberofifo.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_off0000778e.bin
584670b55a094008736ac75ac6d299766a29ea60012213dc46f4a619ebfb4c2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778E 5540 bytes
font_01_sfnt_off00008a36.bin
587d80e9439ee184031c071bd01315609f764b4a775094d6e1594a9e3e736053		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A36 9984 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.