Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73a1a327c0b0e04…

MALICIOUS

PDF

83.2 KB Created: 2020-07-24 14:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0a1c9c06bde51b9a951b68c962965e5 SHA-1: a27f517ba48c4c5cf3992ce16da04718d15d0949 SHA-256: b73a1a327c0b0e0488194a9980c444a4cdbdbc9d88fa8539f1a9a30c38cc44e9
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) that is flagged as malicious. The document body, though heavily obfuscated, appears to contain keywords related to debate formats, likely as a lure. The ML classifier also strongly indicated maliciousness. The primary attack vector involves tricking users into clicking these links, leading them to 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.ru/pify?keyword=oxford+oregon+debate+format+ppt
    • http://files.ccmooresville.com/uploads/1/3/1/3/131381819/tanupip.pdf
    • http://files.mariannecenko.com/uploads/1/3/1/6/131636642/b3ba51cf.pdf
    • http://files.chicagomovietours.com/uploads/1/3/2/6/132695354/bixaje.pdf
    • http://files.aroundtheworldkitchen.com/uploads/1/3/1/8/131858661/luzoso-direpaba-funinomuzo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3156/8290/files/sifomilogimixirajarodaxew.pdf
    • https://cdn.shopify.com/s/files/1/0432/7679/6057/files/72893305310.pdf
    • https://cdn.shopify.com/s/files/1/0433/6356/5727/files/vovijibopufibirunad.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/kudupateperuxinade.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/16187443352.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/44292907310.pdf
    • https://cdn.shopify.com/s/files/1/0433/2768/4760/files/vozusadezuxepujibibawu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3556/files/miziwadudama.pdf
    • https://cdn.shopify.com/s/files/1/0432/7473/1685/files/56399105970.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55781022724.pdf
    • https://cdn.shopify.com/s/files/1/0432/6604/8164/files/97519311845.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_off00010a75.bin
c05cc313ce2ab3e44757cb6136f3365fcf8810b045ceef923d6d93745cddf69d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A75 5128 bytes
font_01_sfnt_off00011bcd.bin
7aa6ff15bb47653b8ba22c2280b397135a06e4c8e2e47562620b531dc13122b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCD 10420 bytes

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