Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72cb11dde8cdb80…

MALICIOUS

PDF

41.0 KB Created: 2020-08-11 14:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a56c565e5d0b6967c33d12f9e04ff4a SHA-1: 8a7844644fd0c9daf367721b4f4f983ee32627df SHA-256: c72cb11dde8cdb80998feaac6f51e1d9dcd4ebfc39a669c8a026965faec124f8
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=achilles+tendonitis+exercise+pdf', which is also flagged as a malicious redirector. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for phishing or malware delivery.

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.cc/pify?keyword=achilles+tendonitis+exercise+pdf
    • http://midedodex.mkgcleveland.com/uploads/1/3/0/7/130775248/1146249.pdf
    • http://davizapu.aussery.com/uploads/1/3/1/4/131482995/jazif.pdf
    • http://files.tucocheaescala.com/uploads/1/3/2/6/132696304/6868951.pdf
    • http://files.elimscandia.org/uploads/1/3/0/7/130738720/xanotoxo_movorimap_vepederixek.pdf
    • https://cdn.shopify.com/s/files/1/0432/4845/1739/files/gumolerudovelonimonetosit.pdf
    • https://cdn.shopify.com/s/files/1/0434/3663/8360/files/chemistry_class_11_chemical_bonding_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/7804/9189/files/xudonulibugijob.pdf
    • https://cdn.shopify.com/s/files/1/0435/4146/3204/files/97529735474.pdf
    • https://cdn.shopify.com/s/files/1/0431/4297/1553/files/10514474231.pdf
    • https://cdn.shopify.com/s/files/1/0429/8414/5049/files/hello_book_of_mormon_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/xuxifamajilowimexisil.pdf
    • https://cdn.shopify.com/s/files/1/0439/1718/1083/files/jizojajapuzumemagom.pdf
    • https://cdn.shopify.com/s/files/1/0435/1878/7736/files/acknowledgement_letter_for_payment_made.pdf
    • https://cdn.shopify.com/s/files/1/0432/3429/5966/files/fekasud.pdf
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/51587064597.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/lugenetesufesukomekevofed.pdf
    • https://cdn.shopify.com/s/files/1/0429/8797/8913/files/bowivasazivegorenadavox.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_off00006400.bin
8a1a55bd136401a87122a1c677c029f1a3f7bfd8bc1498d13e81fb3d1b783ef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6400 5088 bytes
font_01_sfnt_off00007543.bin
d615ee5df530b43ce12b3655ad1c528f1efe604af98e4907a2f8a1c5af2b0197		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7543 9892 bytes

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