Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5b134798bcc907…

MALICIOUS

PDF

51.6 KB Created: 2020-08-29 05:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35d2c6eff2caf23579597f9f5c5904b6 SHA-1: 93c19dba1fd7ffc6858a9843da7994a869b73d10 SHA-256: ef5b134798bcc9076579fa8fa46b822d66849b840576a7df90f35ae2fb11f77b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to distribute malware or lead users to phishing sites. The document body, though heavily obfuscated, contains the same URL and keywords related to 'minecraft', suggesting a lure. The presence of a large number of external PDF links also indicates a link farm, a common tactic for SEO poisoning to drive traffic to malicious sites.

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=minecraft+1.+7.+10+%25C5%259Fehir+map
    • https://static.usrfiles.com/ugd/b8c837_494ce7cd60854615ac4991dba0fcfad5.pdf
    • https://static.usrfiles.com/ugd/b8c837_7972b5d6619d4302a748b76661e89acd.pdf
    • https://static.usrfiles.com/ugd/b8c837_3bf3aa1a346e405286e7181b0cad3c62.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b3437ac93af4eedb579bd23c38eb787.pdf
    • https://static.usrfiles.com/ugd/b8c837_55bf3f6d318a4a059be0e1e5e90bd68c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9fe2f5800e94b7dbf78fdecd968d284.pdf
    • https://static.usrfiles.com/ugd/b8c837_af90e20f444e4385837840cf9242fc11.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b38903ac0944aadbc3783f42a6e28be.pdf
    • https://static.usrfiles.com/ugd/b8c837_ea0533ce3c8841feb61ecfa0bf0c474c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d32996d0bfbd46f9bb88b303c60f149d.pdf
    • https://static.usrfiles.com/ugd/b8c837_874d9c6da6c144c6b21e727e9e793d03.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef5e09b7eced42b080408b2561c9aa22.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee0f358b04a9480d818a34294fcb97e5.pdf
    • https://cdn.shopify.com/s/files/1/0430/8048/2967/files/30016802359.pdf
    • https://cdn.shopify.com/s/files/1/0435/7446/0579/files/13570649770.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/
    • https://cdn.shopify.com/s/f

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000087a4.bin
3eb98be121c7a1657f1fc20edf59cb43148ea78568d3b2793de6219d2ea1c5f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x87A4 5604 bytes
font_01_sfnt_off00009a94.bin
e6c396b9da63842d9dbae096faad92073b827e5e2c9aa1edd801117cc543b391
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A94 11820 bytes