Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8f4dfa8eba7ef2…

MALICIOUS

PDF

44.2 KB Created: 2020-08-11 03:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2a919bd5a568df7e8a518d3799a33e5 SHA-1: 556a45d84b804f5b5bde9e0d97d0db8110faf205 SHA-256: dd8f4dfa8eba7ef23c3ef37b56af9d5638c56baebce3ba790a4b41cd2eb84ef3
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=chronicle+of+a+death+foretold+chapter+1+pdf', is designed to lure users into clicking it by appearing to offer a book chapter. The PDF also exhibits characteristics of a link farm, with numerous embedded links pointing to external PDF files, many hosted on Shopify. 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.cc/pify?keyword=chronicle+of+a+death+foretold+chapter+1+pdf
    • http://files.redriverworkingdogs.com/uploads/1/3/1/4/131438137/582816.pdf
    • http://files.525pathfinder.com/uploads/1/3/0/7/130776220/savex.pdf
    • http://files.nicholasadamswrites.com/uploads/1/3/1/4/131413678/vejuxifu_dowetaz_bokuroxifagaxuj_mukeselesakog.pdf
    • http://files.gevebe.com/uploads/1/3/1/0/131070799/930dc9b0d97dde.pdf
    • http://files.wisconsinwindorchestra.com/uploads/1/3/1/6/131606128/janan.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/46745091020.pdf
    • https://cdn.shopify.com/s/files/1/0429/8620/9439/files/63734731295.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/fovunoxevuwabo.pdf
    • https://cdn.shopify.com/s/files/1/0437/4711/5157/files/ketirotefuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/addition_facts_table.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/77638953377.pdf
    • https://cdn.shopify.com/s/files/1/0435/0859/6900/files/98921991231.pdf
    • https://cdn.shopify.com/s/files/1/0428/3141/3404/files/36925903239.pdf
    • https://cdn.shopify.com/s/files/1/0432/4861/5579/files/jimofeleditoruzi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4386/4228/files/95368211423.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_off00007103.bin
0f2be84bacaaba420312265a06da170dd9116ac88e8b16b5be7766889a6cd1e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7103 5024 bytes
font_01_sfnt_off00008209.bin
07c9e498ab95f4304e4da85260546249c02bc686e165f7495ee47beb8eb34e28
pdf-font-stream PDF embedded font (sfnt) at offset 0x8209 9928 bytes