Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb474ab573f2781…

MALICIOUS

PDF

47.5 KB Created: 2020-08-12 19:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 180cfe365ab0827c04a58dc7a8d0a063 SHA-1: e607dc60540c9e4ec69d6df0fb6e07e8bdfc0add SHA-256: 4bb474ab573f2781f8306daab4153268084026cb0c58ec0d9ed3c38e2a05efd0
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a malicious site. The document also exhibits characteristics of a link farm, with numerous external PDF links, many hosted on Shopify. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed for malicious redirection.

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=character+study+of+daniel+pdf
    • http://files.insta-answer.com/uploads/1/3/1/4/131437873/bivimotikodixik-garovadaka.pdf
    • http://files.wildwva.com/uploads/1/3/1/3/131384335/pukarusikolikasafu.pdf
    • http://files.lttn.com/uploads/1/3/0/8/130873877/1674187.pdf
    • https://cdn.shopify.com/s/files/1/0431/9988/9569/files/voxabilera.pdf
    • https://cdn.shopify.com/s/files/1/0429/0890/9734/files/bogutofuvewadip.pdf
    • https://cdn.shopify.com/s/files/1/0431/3903/9388/files/kebisupaxefexinu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5280/0929/files/ssh_speed_test.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9047/files/business_intelligence_analytics_and_data_science_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0845/files/74525949088.pdf
    • https://cdn.shopify.com/s/files/1/0429/0193/0143/files/65288774323.pdf
    • https://cdn.shopify.com/s/files/1/0430/3519/7602/files/527096660.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5968/files/50804699156.pdf
    • https://cdn.shopify.com/s/files/1/0435/9903/6573/files/jarawolepup.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/34247287810.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_off00007cd9.bin
ff998da95190166b435d75c66d94e8bcca5733952706d0834f752227c81658d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD9 5248 bytes
font_01_sfnt_off00008eb2.bin
4bff19774fd452c1209d2a178add9fd6e7d3fdbe6e635c82e771b11b4f88d575
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB2 10208 bytes