Malicious PDF — malware analysis report

Static analysis result for SHA-256 44dd7b7f52fd2767…

MALICIOUS

PDF

42.4 KB Created: 2020-08-12 12:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 196eb0611af442a7588f2b9c397372e8 SHA-1: 2d2611f6732392410b1311a76a83587b0651a49c SHA-256: 44dd7b7f52fd2767d8d9b005d01df762b0e5f4aebb3898e67ec51e64dad38ee3
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various domains, including a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, and 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms a link to malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains the URL https://ttraff.cc/pify?keyword=kamikaze+poem+pdf, which is a known malicious redirector.

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=kamikaze+poem+pdf
    • http://gukimed.macehammerfitness.com/uploads/1/3/1/4/131437252/letevubimonuxutoli.pdf
    • http://files.traditionalgreece.com/uploads/1/3/1/1/131163736/megev.pdf
    • http://zibot.acupunctureforpain.co/uploads/1/3/0/7/130740051/c3717e2457.pdf
    • http://tuzeren.purbeautybazaar.com/uploads/1/3/1/8/131871740/menob.pdf
    • https://cdn.shopify.com/s/files/1/0429/3551/7337/files/carotid_stenosis_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0437/9662/7616/files/jevodenezibowefuzafok.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/lotumasajifakizatume.pdf
    • https://cdn.shopify.com/s/files/1/0433/2008/2590/files/muwezejixekugixiwurure.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/principles_of_language_acquisition.pdf
    • https://cdn.shopify.com/s/files/1/0430/3434/5625/files/pokemon_adventure_chapter_1.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/rbxasset_sounds_uuhhh._mp3.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8330/files/65057172207.pdf
    • https://cdn.shopify.com/s/files/1/0428/9311/5548/files/bowikopax.pdf
    • https://cdn.shopify.com/s/files/1/0436/8728/0790/files/89084284311.pdf
    • https://cdn.shopify.com/s/files/1/0433/9128/7452/files/74421607220.pdf
    • https://cdn.shopify.com/s/files/1/0440/2656/0677/files/muwenuxiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/0181/3915/files/24535414609.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/
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/rbxasset_so

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069bf.bin
1475be0945b90a2318d839b8aa1d8cc1bc952f0675372e466ccefb2acd8e0b1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69BF 4964 bytes
font_01_sfnt_off00007aa1.bin
c8caf1cbe68c36a923ff61714d73c19dce678067cd8f29b8f32baada6c6aa35e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA1 9828 bytes

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