Malicious PDF — malware analysis report

Static analysis result for SHA-256 9334f793d361ef59…

MALICIOUS

PDF

41.7 KB Created: 2020-07-22 17:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34c7b74698a92f473eeeebbd7334959d SHA-1: 4d2d84d90df3876fbea27bccd8513b8ba050ceef SHA-256: 9334f793d361ef591de8524bed92de88f5a46e60c1f6c609a28f1293e0fb021c
152 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 'ttraff.ru'. Additionally, it exhibits a PDF link farm heuristic, with numerous links pointing to PDFs hosted on platforms like Shopify. The ML classifier also strongly indicated maliciousness. The embedded document body, though heavily obfuscated, appears to be related to educational content, likely a lure.

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/wb?keyword=comparative%20vs%20superlative%20worksheet
    • http://files.marcyearthscience.com/uploads/1/3/1/0/131070144/xipawutagu-lagurudafapu.pdf
    • http://files.beckervetclinic.com/uploads/1/3/0/8/130814611/bc5e721307.pdf
    • http://files.doorwaystoadventure.com/uploads/1/3/0/9/130969704/dawimijo.pdf
    • http://files.bugsweedsmore.com/uploads/1/3/2/6/132682681/wefirosodumet.pdf
    • http://files.doorwaystoadventure.com/uploads/1/3/0/
    • https://cdn.shopify.com/s/files/1/0432/5048/3368/files/juvagewebaworip.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/vilazetirelexuput.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/45993815253.pdf
    • https://cdn.shopify.com/s/files/1/0431/1593/7948/files/29994404446.pdf
    • https://cdn.shopify.com/s/files/1/0430/0403/5221/files/18982681663.pdf
    • https://rijubunaji.files.wordpress.com/2020/07/61112039353.pdf
    • https://fumepuwabipa.files.wordpress.com/2020/07/74951645171.pdf
    • https://tofosigon.files.wordpress.com/2020/06/xajedas.pdf
    • https://lonovusuko.files.wordpress.com/2020/06/15301213976.pdf
    • https://pigarudumo.files.wordpress.com/2020/07/bibenepu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6952/9509/files/gexisagug.pdf
    • https://cdn.shopify.com/s/files/1/0430/7773/0464/files/gekeduzidaralel.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/71794471591.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/vezopelasoxuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/jewagamomex.pdf
    • https://cdn.shopify.com/s/files/1/0434/3349/2641/files/zaxisenu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/xirofopadajabegovazab.pdf
    • https://cdn.shopify.com/s/files/1/0428/3439/5295/files/82150346562.pdf
    • https://cdn.shopify.com/s/files/1/0434/0786/8060/files/zajudofopuwogi.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_off000066eb.bin
5d709d3ea15927a3f7110202f910591c45397b5e427dd104ff9c128c6665474b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66EB 5076 bytes
font_01_sfnt_off00007842.bin
d2eaa6d2e04d0b2126c07682502407a7fb1b9faf22a55e9aeee44034f1b071f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7842 9732 bytes

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