Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9b8985a4e07642…

MALICIOUS

PDF

144.9 KB Created: 2020-08-05 00:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb876ee244e4c8896287fdf994dc89c6 SHA-1: 36076c5e2b7bc967d409bd14064801bb1a2c8afc SHA-256: 3b9b8985a4e07642071d8d53005c1a67d3091271313e50336640148a2b5d6bef
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lead users to further malicious content. Additionally, the PDF hosts a large number of external links, many pointing to Shopify-hosted PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the presence of malicious URLs is sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/pify?keyword=libro+arbatel+pdf
    • http://files.bandofbrothersshakespeare.org/uploads/1/3/2/7/132712282/2fdcfd9760c.pdf
    • http://files.dennisplott.com/uploads/1/3/2/7/132740767/983954.pdf
    • http://files.bensawyermusic.co.uk/uploads/1/3/2/7/132740218/kelupotamevivok.pdf
    • http://xizogino.thewriterhobbyist.com/uploads/1/3/0/7/130738615/wazekibaw-faroxo.pdf
    • http://lofipizad.fullcirclefarmsanctuary.org/uploads/1/3/2/3/132302963/mowigar.pdf
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/jezosabidesijutomobamuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/7840/9622/files/sotimuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/5723/3576/files/resinojof.pdf
    • https://cdn.shopify.com/s/files/1/0430/8179/3698/files/aia_g701_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/23108721216.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/jidureg.pdf
    • https://cdn.shopify.com/s/files/1/0434/6177/1430/files/79528718421.pdf
    • https://cdn.shopify.com/s/files/1/0431/0908/9434/files/341767950.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6624/files/repijaraxinodoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2992/files/bolopuwiko.pdf
    • https://cdn.shopify.com/s/files/1/0434/9856/9888/files/wordpress_too_many_redirects.pdf
    • https://cdn.shopify.com/s/files/1/0430/3051/1779/files/jejevebevafekamojojib.pdf
    • https://cdn.shopify.com/s/files/1/0430/4125/9671/files/waste_management_and_research_journal.pdf
    • https://cdn.shopify.com/s/files/1/0433/8014/6339/files/62771060973.pdf
    • https://cdn.shopify.com/s/files/1/0430/9660/4825/files/hollow_knight_lake_of_unn.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_off0001f70f.bin
c854c3055fc7660fdfba03f21d0689344c5d274c598b38a5fdff43ac254a1cc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F70F 4936 bytes
font_01_sfnt_off000207e8.bin
85407efdbe22db8a6e7058408f01325f644bcb9ca4b54c25e6e60d4c3742cb1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x207E8 14516 bytes

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