Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c092cd45dc5ebfc…

MALICIOUS

PDF

34.0 KB Created: 2020-09-06 21:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0380a29571d3d215f8585316e342bab SHA-1: 00f4759d27a1476fb9b26919063af17e850ce85c SHA-256: 2c092cd45dc5ebfc4e39a1e05371fa3ff88a06b7228ced0d1dcd7896e2dd0cf7
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL designed to lure users with a 'happy birthday card' theme. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic. The ML classifier strongly indicates malicious intent. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.club/pify?keyword=happy+birthday+card+image+with+name
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/kexej.pdf
    • https://cdn.shopify.com/s/files/1/0428/9570/4227/files/56120924657.pdf
    • https://cdn.shopify.com/s/files/1/0431/0928/6050/files/naxijejipelugaxikaki.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4105a9085274f2aa15636327422548c.pdf
    • https://static.usrfiles.com/ugd/8b97dd_2817af2eb4ad42788e2f397b1f8f4762.pdf
    • https://static.usrfiles.com/ugd/599026_32de19f8cab042a2b01b107ec9b4de32.pdf
    • https://static.usrfiles.com/ugd/61804c_88636360b4d949ad8b8cfefb11644417.pdf
    • https://cdn.shopify.com/s/files/1/0433/8833/8330/files/canon_rebel_t5_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/7047/8746/files/romigetoralik.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jomanumono.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_off0000483e.bin
64f6b8962d60f66b453427faf29ebb760c51855b34d0191ed1228092613fa192		 pdf-font-stream PDF embedded font (sfnt) at offset 0x483E 5572 bytes
font_01_sfnt_off00005b16.bin
b1d33b58d7d292cffce26786b1feb1777fc480de4f4e0c88d0c9ee66620e26bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B16 9572 bytes

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