Malicious PDF — malware analysis report

Static analysis result for SHA-256 35372c00bfdb291a…

MALICIOUS

PDF

39.2 KB Created: 2020-09-09 00:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39afa3309d75569cb6317faddd4e6035 SHA-1: 9d54ae46587c87bed2a4c8634c9f5c659fd0d36b SHA-256: 35372c00bfdb291ac37eb1195bd4edbf1fbcf4a514bf9d9cd9b25f2c0792f6c6
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, disguised with keywords like 'handwriting worksheets grade 1 pdf'. The ML classifier strongly indicates maliciousness. The embedded URLs suggest a phishing or scam attempt to redirect users to malicious 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.club/wix?keyword=handwriting+worksheets+grade+1+pdf
    • https://cdn.shopify.com/s/files/1/0431/5290/0260/files/healing_architecture_in_hospital_design.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/95802722279.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/18565122733.pdf
    • https://static.usrfiles.com/ugd/856cea_7d987c907d9b454db5a5ed4f9af0a1a9.pdf
    • https://static.usrfiles.com/ugd/544c7e_b6d95a942a5244beaafe52d41923780c.pdf
    • https://static.usrfiles.com/ugd/10b11f_0aea540e277f441e9c19c6dcbbf17907.pdf
    • https://static.usrfiles.com/ugd/a771bd_83dbf67e95c54c758813dddf0b8b6ae2.pdf
    • https://static.usrfiles.com/ugd/a9248e_746e367003d444d7b8113590b51e1c2a.pdf
    • https://static.usrfiles.com/ugd/2074c9_27477f55f81a4cf5b05f8ad5a4c6b49a.pdf
    • https://static.usrfiles.com/ugd/0a052f_0d62fd5050bb4dc58e4ef7d80ec56938.pdf
    • https://static.usrfiles.com/ugd/b80405_8b141304a98d447ab7e0bba8d813e031.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_off00005b93.bin
e3ce36730f229e0c856884f9bf2a0b745d2f2accdc31c93e0f3bb1d4001c6604		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B93 5440 bytes
font_01_sfnt_off00006e28.bin
cc5576684f52df97998da42a6a63e5b91a99a271954287d0bfcf97eb908b86d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E28 10060 bytes

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