Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b84bf3d8db179f1…

MALICIOUS

PDF

41.0 KB Created: 2020-08-22 21:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fccec324caa8bba460af6f9b79301a8e SHA-1: d07119e35f3dfaede190b71111f72a2eccc7ad7a SHA-256: 5b84bf3d8db179f1bb8d212d45917f10ca2ea4dfea2d6ff2168708a774e591cf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=blood+type+a+recipes+pdf'. It also contains a large number of embedded links, many of which point to benign Shopify URLs, but the primary malicious link is clearly intended to redirect the user. The document body, though heavily obfuscated, contains the malicious URL and other links, suggesting a link farm or redirection tactic.

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=blood+type+a+recipes+pdf
    • http://files.proletas.com/uploads/1/3/1/6/131637881/tumaxadomi-judepirurigi.pdf
    • http://najuwi.multimodalwritingcenter.org/uploads/1/3/0/7/130776760/gabukibetigo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7433/8454/files/chickenpox_in_pregnancy.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3287/files/59083420213.pdf
    • https://cdn.shopify.com/s/files/1/0433/6451/6005/files/30107155728.pdf
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/75223285904.pdf
    • https://cdn.shopify.com/s/files/1/0439/1193/8216/files/pasumamodusu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/62545806626.pdf
    • https://cdn.shopify.com/s/files/1/0432/5572/6238/files/unlimited_catapult_king.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8128296882.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7033/files/ballade_pour_adeline_piano_sheet_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/duvonetipenokezotajijun.pdf
    • https://cdn.shopify.com/s/files/1/0431/2301/5841/files/photosynthesis_and_cellular_respiration_crossword.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1942/files/fuwid.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006250.bin
11312fd5d1b7aee3e87840823652a72175b297e1e7ff42692a00b3314449962c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6250 5300 bytes
font_01_sfnt_off0000746f.bin
c490c1e781cd0e1cb02ea4a00105f892502a0c9e031a90e119c15177bd9f0fbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x746F 10352 bytes