Malicious PDF — malware analysis report

Static analysis result for SHA-256 b690148f29347ba1…

MALICIOUS

PDF

45.2 KB Created: 2020-08-29 11:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e28c8735fdb1944a894a4d9940b36691 SHA-1: 6d82866ac382e7caf8defe8c5926c89a74933d28 SHA-256: b690148f29347ba1b358193e3035ea96624fc0f3a7931b7834be05a3ebabf939
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This URL is embedded within the document, likely intended to trick the user into clicking it. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the suspicious URL.

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.com/wix?keyword=c+6751+bizhub+c224e
    • https://cdn.shopify.com/s/files/1/0432/6444/2521/files/high_performance_catamaran_power_boats.pdf
    • https://cdn.shopify.com/s/files/1/0428/5680/8615/files/9472543754.pdf
    • https://cdn.shopify.com/s/files/1/0438/2674/1405/files/someone_like_you_ukulele_chords.pdf
    • https://cdn.shopify.com/s/files/1/0429/1703/6198/files/49756777360.pdf
    • https://cdn.shopify.com/s/files/1/0431/6348/4315/files/54816011946.pdf
    • https://cdn.shopify.com/s/files/1/0431/7852/4831/files/69369791131.pdf
    • https://cdn.shopify.com/s/files/1/0438/0003/5490/files/mikajalig.pdf
    • https://cdn.shopify.com/s/files/1/0434/4011/1782/files/zakaguzekadokifibamam.pdf
    • https://cdn.shopify.com/s/files/1/0428/8380/9447/files/86516248020.pdf
    • https://cdn.shopify.com/s/files/1/0457/0431/5036/files/glycosuria_in_pregnancy_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0431/4320/0929/files/3021832602.pdf
    • https://static.usrfiles.com/ugd/b8c837_dbc86303433246dcb82dd1b2eb167b25.pdf
    • https://static.usrfiles.com/ugd/b8c837_de65114771cc4a4da31b3019933ad817.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec8fa0036ef7465ea804f506bcd2eca4.pdf
    • https://static.usrfiles.com/ugd/b8c837_e835c8c5d900456da26b5ef66bba75af.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/files/1/0457/0431/503

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068fa.bin
95ed3a6de045a778558947f5d846ec568a5aac7a29b258249fe7f2030a433b65
pdf-font-stream PDF embedded font (sfnt) at offset 0x68FA 5096 bytes
font_01_sfnt_off00007a6c.bin
0edf2dbd1d73b48ce328e7c48281aacdc02454e9893caabdf42f12d47e0e7fec
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6C 14540 bytes