Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e1637f28ff9b5c…

MALICIOUS

PDF

36.0 KB Created: 2020-08-21 12:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1279a8414c37534db57c8be5da57aa4 SHA-1: 03b7aadecaef8430efad57efbc1ced572e89a088 SHA-256: 58e1637f28ff9b5c9950f3944f366224e0e87ee23cb4e28c3dfd1c441e25b9e9
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, indicating an attempt to drive traffic to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest a phishing or scam attempt disguised as educational content.

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/pify?keyword=congruent+triangles+coloring+activity+answer+key
    • http://mapimod.reneetenna.com/uploads/1/3/0/8/130874384/4551039.pdf
    • http://files.beckleyflag.com/uploads/1/3/0/7/130739204/09e9c9d10985c59.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5003/files/malondialdehyde_lipid_peroxidation.pdf
    • https://cdn.shopify.com/s/files/1/0431/6705/6028/files/libowivunukofi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0441/8455/files/2373561999.pdf
    • https://cdn.shopify.com/s/files/1/0431/5152/4008/files/79964755522.pdf
    • https://cdn.shopify.com/s/files/1/0434/8998/4678/files/16999836092.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9583/files/kasikosugeverefip.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74140302582.pdf
    • https://cdn.shopify.com/s/files/1/0433/0402/6280/files/zapimesawogijiwik.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0944/files/nexexafaga.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_off00004e44.bin
e246ef1277a1528086d32ac2a59ad963aeeb23222f6f4a80d05e9c3e81fce87a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E44 5188 bytes
font_01_sfnt_off0000601a.bin
a71256368bf8e95f48f9a7b17cffd4793df18a577624e29bb7047e3534535339		 pdf-font-stream PDF embedded font (sfnt) at offset 0x601A 10404 bytes

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