Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9aa833ca53034c1…

MALICIOUS

PDF

40.8 KB Created: 2020-08-06 18:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a690e1357cb2d03640bb40704fa3373 SHA-1: c2402010e2c283f40b807403f4219d2acd6b1f7c SHA-256: d9aa833ca53034c1e025da44706df44ec914f12fb4fc252e441d72b319f9b6c0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL that is also present in the heuristic firing. The PDF also hosts a large number of external links, suggesting a link farm for SEO manipulation, which is flagged by PDF_SEO_LINK_FARM. The ML classifier strongly supports the malicious verdict.

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=sql+server+2020+development+tutorial+pdf
    • http://files.wilmingtonohw2020.com/uploads/1/3/0/7/130776817/7871241.pdf
    • http://files.platformfriesdressuurpaard.nl/uploads/1/3/1/4/131437702/cd21db58b.pdf
    • http://files.gordonlheath.com/uploads/1/3/0/8/130814226/bikube.pdf
    • http://files.champlainneuroscience.com/uploads/1/3/0/7/130740438/wonazogewu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8207/2732/files/90103767219.pdf
    • https://cdn.shopify.com/s/files/1/0432/6028/0982/files/lixatisekabu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52135332303.pdf
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/gojagujamu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8022/0826/files/febifuratavezoxikagufopov.pdf
    • https://cdn.shopify.com/s/files/1/0434/0121/6163/files/96199595192.pdf
    • https://cdn.shopify.com/s/files/1/0433/2398/1979/files/arduino_mega_2560_ch340_schematic.pdf
    • https://cdn.shopify.com/s/files/1/0434/0681/9493/files/55335362996.pdf
    • https://cdn.shopify.com/s/files/1/0429/0579/6774/files/javugisukobibuv.pdf
    • https://cdn.shopify.com/s/files/1/0440/6899/5224/files/pathophysiology_of_pneumonia_in_child.pdf
    • https://cdn.shopify.com/s/files/1/0433/9951/2231/files/51574803821.pdf
    • https://cdn.shopify.com/s/files/1/0435/4136/4890/files/sap_bpc_tutorialspoint.pdf
    • https://cdn.shopify.com/s/files/1/0437/2830/6341/files/dezakinale.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_off00005fd7.bin
640008f58d17e33d8c77514bb9d0542fe9e553b34ee049ef060f4b2cd3e7207e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD7 5752 bytes
font_01_sfnt_off0000735c.bin
4b349ece1f7e068a6aa1d9e28a59afff88330157b241f5421b7b513ce7a285b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x735C 10216 bytes

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