Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d27e5ab3d792107…

MALICIOUS

PDF

40.6 KB Created: 2020-08-15 05:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0715ae5ae5aa86921f065f0b5c903fcc SHA-1: de3bbec069831d4d0ee18ad0a036d19c455c79e5 SHA-256: 4d27e5ab3d79210725b4bfa4bf93f29701b159e3b5f5cf00e2a4196f99e9eb73
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wb?keyword=chava%20kadambari%20pdf%20file%20download%20in%20marathi'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, some of which are hosted on potentially suspicious domains. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the primary malicious URL and several other PDF links, suggesting a lure to download further content or visit malicious sites.

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=chava%20kadambari%20pdf%20file%20download%20in%20marathi
    • http://tatuzav.twofellersliveedgelumber.com/uploads/1/3/1/4/131406717/6082002.pdf
    • http://files.bapfiu.org/uploads/1/3/1/4/131437123/tapir.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4705/files/86815377711.pdf
    • https://cdn.shopify.com/s/files/1/0435/6423/6968/files/dawonusemirijadonajaten.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5944/files/the_investigators_of_arkham_horror_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/1003/8683/files/you_better_run_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0429/5468/6617/files/zagigijuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/4089/1292/files/43505804076.pdf
    • https://cdn.shopify.com/s/files/1/0438/5538/0630/files/dunazuribavevuseke.pdf
    • https://cdn.shopify.com/s/files/1/0430/4653/5322/files/xagoferelero.pdf
    • https://cdn.shopify.com/s/files/1/0429/0641/9367/files/alluvial_soil_characteristics.pdf
    • https://cdn.shopify.com/s/files/1/0435/1849/2824/files/memorex_dvd_player.pdf
    • https://cdn.shopify.com/s/files/1/0431/0394/4853/files/18511160135.pdf
    • https://cdn.shopify.com/s/files/1/0440/6856/9238/files/christian_smith_moralistic_therapeutic_deism.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b9d.bin
cc008839174292326b883e6b689353bd3faee4f41fbb196d478d15c98c6efb71
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B9D 5364 bytes
font_01_sfnt_off00005dca.bin
c288f68e17f7e6384b0fe7144ea286e067ee50527f3f4be7691d48681b531d5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCA 9840 bytes
font_02_sfnt_off00007faa.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FAA 16164 bytes