Malicious PDF — malware analysis report

Static analysis result for SHA-256 d926f97830b4bac1…

MALICIOUS

PDF

40.5 KB Created: 2020-08-17 02:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5c3ff6237a19a55db32d0d5f193cf3b SHA-1: 43fcc95afca103de8b17d2e2ad880802d90a7c4c SHA-256: d926f97830b4bac12d98cd7f1a0cfc542cf986171e65c6685b75ebf38abd58eb
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier strongly flagged this PDF as malicious. The document also contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning attempt to mask the malicious redirector. No scripts were extracted from this sample.

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=manualidades+con+papel+crepe+para+san+valentin
    • http://files.johnanthonyguitars.com/uploads/1/3/0/7/130739147/tefixifovipe_xazudusemab.pdf
    • http://wifozaker.mrtrombetta.com/uploads/1/3/2/6/132681579/3200650.pdf
    • https://cdn.shopify.com/s/files/1/0431/1826/4469/files/week_2_football_picks_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/1415/2607/files/venatiwuromeredele.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6985/files/3ds_max_interior_design_tutorials.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/nutadonogevegubobinu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/kamunokikapotukamavo.pdf
    • https://cdn.shopify.com/s/files/1/0435/0109/3030/files/7380553990.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93515438816.pdf
    • https://cdn.shopify.com/s/files/1/0435/0056/8736/files/27692954619.pdf
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/scipy_multivariate_normal_log.pdf
    • https://cdn.shopify.com/s/files/1/0431/5535/7852/files/2007_vw_rabbit_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/6803/0102/files/86787752975.pdf
    • https://cdn.shopify.com/s/files/1/0441/3983/9640/files/47764864988.pdf
    • https://cdn.shopify.com/s/files/1/0433/9027/1642/files/91788190834.pdf
    • https://cdn.shopify.com/s/files/1/0430/7478/1338/files/79583328.pdf
    • https://cdn.shopify.com/s/files/1/0429/7791/9129/files/kurodapetugelu.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_off00005eb5.bin
f621ae46747383f078cda67af514dcb66759645563ff52466759ef3ded11ef2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB5 5132 bytes
font_01_sfnt_off0000703d.bin
e986e4d3fd1cd49d163ec627b6aff18611f8161aa6772506e5700abad3677d71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x703D 10812 bytes

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