Malicious PDF — malware analysis report

Static analysis result for SHA-256 596b4e36fd585d33…

MALICIOUS

PDF

48.4 KB Created: 2020-08-19 10:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f52786f5cdec54d5e877227fb9d5b423 SHA-1: aefbeb17c175d30846f9a9f6f4480b37156148a8 SHA-256: 596b4e36fd585d3367e0991a06ae64beaa66f40baf46aad1b7c7f8a411562b94
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a large number of external links, indicating a potential link farm or SEO manipulation tactic. One of the embedded URLs, 'https://ttraff.ru/pify?keyword=braham+kavach+pdf+in+punjabi', is associated with known malicious redirector infrastructure. The document body, though heavily corrupted, contains references to the same URL and other Shopify-hosted PDF files, suggesting a coordinated effort to distribute malicious content or manipulate search engine results.

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=braham+kavach+pdf+in+punjabi
    • http://files.breenabuettner.com/uploads/1/3/1/4/131437623/kogejelox.pdf
    • http://files.kinnorclassics.com/uploads/1/3/1/6/131637163/pojazukixexesim.pdf
    • https://cdn.shopify.com/s/files/1/0437/7778/6018/files/ponupimizozekokitetupab.pdf
    • https://cdn.shopify.com/s/files/1/0433/9063/2101/files/99380653230.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/cfm56_5b_engine.pdf
    • https://cdn.shopify.com/s/files/1/0429/4852/6246/files/tamabe.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/26665673374.pdf
    • https://cdn.shopify.com/s/files/1/0433/4364/2773/files/berlitz_japanese_in_30_days.pdf
    • https://cdn.shopify.com/s/files/1/0439/2045/7883/files/civil_engineering_drawing_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/1790/3008/files/cahier_de_vacances.pdf
    • https://cdn.shopify.com/s/files/1/0429/9902/1731/files/waiting_for_the_barbarians_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/7542/0835/files/92733602208.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/21_jump_street_watch_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/8149/7766/files/36434992002.pdf
    • https://cdn.shopify.com/s/files/1/0434/5177/7185/files/26224626948.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006668.bin
8ca42097f5920ad1f6bc473d178af26c2e4206a54edb83037a624972ce506e27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6668 5576 bytes
font_01_sfnt_off00007936.bin
0205ddf57b62bc97bd90587cc778989db48d0e6d78c7b261d7abbd2f6ca421db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7936 2268 bytes
font_02_sfnt_off00008330.bin
3a36f455bb32f2f9d0b739ef3f8e5a92ba70c42493b2e5a1d828fd41b15b60a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8330 16116 bytes

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