Malicious PDF — malware analysis report

Static analysis result for SHA-256 716ced56a0ef5e12…

MALICIOUS

PDF

130.5 KB Created: 2020-09-02 11:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1865b0e8de631f37b9d9938f4ef8f2b8 SHA-1: 40bc62708c6a30deeaf226e6187463bd70ad6c64 SHA-256: 716ced56a0ef5e128b5cf4840ce01c5312389d4abd8c2bff2b9eabba81afcff6
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document identified as malicious by an ML classifier and heuristic rules. It contains a link to a redirector, which is part of a suspected advance-fee scam lure. The document body, though heavily obfuscated, contains the URL that is also listed in the heuristics as a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.link/wix?keyword=akiba%2527+s+trip+trophy+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_72f3e7aed4a646a0a6eb583b5daed43c.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_f3ced4755bca4b00ac0bafb8dc775aa3.pdf
    • https://static.usrfiles.com/ugd/b8c837_6eb42687800c443eb52a2112910756ff.pdf
    • https://static.usrfiles.com/ugd/8b2c09_7be04254913d49cba59ce3e12df0e9d6.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8023/files/gobi_manchurian_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8680/7201/files/76987253172.pdf
    • https://cdn.shopify.com/s/files/1/0431/1675/7153/files/poluburidu.pdf
    • https://static.usrfiles.com/ugd/b3bc21_5abe40d9b8cb405cb0694a1b3b04f2b7.pdf
    • https://static.usrfiles.com/ugd/2c608b_eada99704cc44ebd950d6984ee50722b.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015369.bin
17d8ccfba6ffd1bfe747a12fd9d8190a4fd4def3716827dfa3fe7f0fa35d59d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15369 24176 bytes
font_01_sfnt_off00019f6b.bin
9494b792738e9fac314f5057989070b107f59cebef764aaa112e38084a8495dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19F6B 5516 bytes
font_02_sfnt_off0001b234.bin
a745413e527f0619c8c08104730bbab8fa7285ac1e6c68f05e02c5713161115c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B234 17176 bytes
font_03_sfnt_off0001e748.bin
2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E748 16092 bytes

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