Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9ff667c76810db…

MALICIOUS

PDF

37.4 KB Created: 2020-09-03 00:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de1a0b7fc9230eec2c6b0c5150f90002 SHA-1: f38cc50fb4460ad8ea5d6d4d81212da3cb2976bb SHA-256: 4f9ff667c76810db9f65350e7e993f20c70656940a6ec1e3d5ec0d1d5b9cf26c
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that points to this redirector. The redirector likely serves as a gateway to a phishing page or malware download. The presence of numerous Shopify links, while many are benign, suggests an attempt to blend in with legitimate content while masking 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=vidya+vox+video+songs++be+free
    • https://cdn.shopify.com/s/files/1/0437/1798/4405/files/77359198767.pdf
    • https://cdn.shopify.com/s/files/1/0434/4610/8312/files/45734244658.pdf
    • https://cdn.shopify.com/s/files/1/0431/6528/6566/files/14431074869.pdf
    • https://cdn.shopify.com/s/files/1/0428/7099/7151/files/24218991910.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/inductive_logical_thinking.pdf
    • https://cdn.shopify.com/s/files/1/0433/5301/4423/files/libro_sagrado_budismo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6251/8182/files/45553254645.pdf
    • https://cdn.shopify.com/s/files/1/0469/2967/4395/files/the_entertainer_sheet_music_beginner.pdf
    • https://cdn.shopify.com/s/files/1/0427/7259/4844/files/49583129119.pdf
    • https://cdn.shopify.com/s/files/1/0430/5007/4269/files/winnebago_parts_manual.pdf
    • https://static.usrfiles.com/ugd/a2d007_eef634f24314481fa8f8a086aca0c33c.pdf
    • https://static.usrfiles.com/ugd/a58b01_32c9600f1f2b44e0b8c7e1b3cb925835.pdf
    • https://static.usrfiles.com/ugd/b8c837_1abaf3a6c2874118b59002efce9736c7.pdf
    • https://static.usrfiles.com/ugd/278743_8527acb2df294fcbb4ae2d2ba171b28d.pdf
    • https://static.usrfiles.com/ugd/f1780b_cac474405eb24a71a0c971cd02d079ca.pdf
    • https://static.usrfiles.com/ugd/278743_1d18413bcfb8447494313c0f985bc573.pdf
    • https://static.usrfiles.com/ugd/b8c837_85ce0891ebfe4382ab458826ebf6b0b0.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_off0000548d.bin
26b683b6b42bb591fbb73be286a01824b7a76f1d741d425e651b7979df5225d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x548D 5380 bytes
font_01_sfnt_off000066f2.bin
50c8039ab77edf97fa0dfa156024230ea37889e6570eb28cdcc00410eedaf581		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F2 9896 bytes

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