Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c62c9995035e8b…

MALICIOUS

PDF

52.9 KB Created: 2020-09-01 01:38:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d42377e6bb88a3bf45381244a29e2c9a SHA-1: ad2890c0e43f32c95d90855eabb8bd0315c85ee1 SHA-256: 78c62c9995035e8bc6642c24d3b60e286ecae3fb5570313b8eb38fb2a1011897
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to a link farm infrastructure. One of the primary links, https://ttraff.ru/wix?keyword=lean+organisation+management+techniques+answers, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text is obfuscated and appears to be filler content, with the actual malicious links embedded within the PDF structure.

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/wix?keyword=lean+organisation+management+techniques+answers
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/9ea9b6_660cf29e1e1a49c4888e108db65d0ad0.pdf
    • https://static.usrfiles.com/ugd/ce77c6_315bcf0fc9344c81b6ad3e985f1fde81.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_f5223e760c4148c8bbd87a67aecfa3f5.pdf
    • https://static.usrfiles.com/ugd/87a178_05ef1fe47ff74849bc9f24da3541128d.pdf
    • https://static.usrfiles.com/ugd/c83fdb_7c5075aa0e214f1b8b9b093cb4bec604.pdf
    • https://static.usrfiles.com/ugd/ac72e0_6ad73d88fb094059ba99c3ab0fb06f8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_582e8594b21e426ab2e43ed936f35e88.pdf
    • https://static.usrfiles.com/ugd/b8c837_423207164244401794b466760c6e51b7.pdf
    • https://static.usrfiles.com/ugd/bfbc46_f86b21091dbe4acd9e10612356763025.pdf
    • https://static.usrfiles.com/ugd/b8c837_292b33e770de484aaf91ce4a74933f5e.pdf
    • https://static.usrfiles.com/ugd/7041e4_e218f6db314c45638004bd5ee338d84a.pdf
    • https://static.usrfiles.com/ugd/e745be_6aadd2be3e4f4389aeaf8461c36d7944.pdf
    • https://static.usrfiles.com/ugd/b8c837_528edf90f4e54b988b0956dccf9e278c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4d5a6f8fc114c37a8460fbd3a5fed15.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000872f.bin
df161fe416fa9411a695e34f6f8024972bbbbf35381819bf9d1d4098dab7dfe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x872F 1728 bytes
font_01_sfnt_off00008f4a.bin
be54a2598286b7f32750bdbbe91d168604fdae863e6ce549e0489aeb5debb47f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F4A 5340 bytes
font_02_sfnt_off0000a160.bin
579efdd9900efd649bcaa1706420f52b205532098527e32e5e2752ece9a9894d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA160 10840 bytes

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