Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f19f61bc5cd8b2…

MALICIOUS

PDF

36.0 KB Created: 2020-08-29 05:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5346253428a0b3dd5ef86236f9df743 SHA-1: aafa7053916dd87461a894accf5abb67baa31c16 SHA-256: c7f19f61bc5cd8b26bd081fb750f087aa64f2cfe8e6b0d2c681b84349c4cebf0
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, includes text related to a PDF manual search and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm designed to attract traffic to the malicious redirector.

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/wix?keyword=university+physics+with+modern+physics+13th+edition+solutions+manual+pdf+free+download
    • https://cdn.shopify.com/s/files/1/0431/7370/7925/files/caesalpinia_coriaria.pdf
    • https://cdn.shopify.com/s/files/1/0437/3548/2517/files/57771071788.pdf
    • https://cdn.shopify.com/s/files/1/0433/7179/0494/files/2010_toyota_prius_owners_manual.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ab88d13d7d44d0288ab190757688216.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/43900071823.pdf
    • https://cdn.shopify.com/s/files/1/0431/6590/9160/files/building_construction_specification_uk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13908697451.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0d15a98e73a46568002f219140aba0e.pdf
    • https://static.usrfiles.com/ugd/b8c837_42f48f3749bd4b23a784bc403d0db627.pdf
    • https://static.usrfiles.com/ugd/b8c837_8ed5dcf84bea4e1887ed27bc043eac2f.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_off000049d2.bin
cd1780726873ee5ff82f4754c3de079ccc774f7270442404f4e1ce9496741fcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49D2 5856 bytes
font_01_sfnt_off00005db0.bin
a72b60a2e0495a4827e408851170ec79566d26528531e8f56ebe9f4fd489c929		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB0 11024 bytes

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