Malicious PDF — malware analysis report

Static analysis result for SHA-256 404bf6d8429d5f50…

MALICIOUS

PDF

47.0 KB Created: 2020-08-30 06:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4afd675160aa8e18b42b0e97d275416 SHA-1: d9a8fffadaedae71e1917f2ffcbc19270470f382 SHA-256: 404bf6d8429d5f500b0a298d429abd66cabdc734284eca2242fa018c81d48f17
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.ru/wix?keyword=apple+shooter+unblocked+games+77', is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous links to external PDFs, many hosted on 'static.usrfiles.com', indicates a strategy to obscure the ultimate destination and potentially leverage SEO techniques for distribution.

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=apple+shooter+unblocked+games+77
    • https://static.usrfiles.com/ugd/fe83c3_cad57b34768b4d0a8cf2f06af60e7f39.pdf
    • https://static.usrfiles.com/ugd/1c90dc_363971559c4e4798978664fc5fd6b05b.pdf
    • https://static.usrfiles.com/ugd/585b1d_6c7f72f697744a0fb76c59c7f8307611.pdf
    • https://static.usrfiles.com/ugd/b914b5_892f22ba72bb47a08b2460211daaa598.pdf
    • https://static.usrfiles.com/ugd/b8c837_15f326ea0ada4b75873805b2b7f733ef.pdf
    • https://static.usrfiles.com/ugd/96768c_851a54242e1040c3b1b28b534f71001a.pdf
    • https://static.usrfiles.com/ugd/0049ca_e1006d99052e42a29557bac8c867d2b2.pdf
    • https://static.usrfiles.com/ugd/affaa6_7b78e2bc2b2149498d8b7a37d2405e46.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_51667dfdb0f2408c99f5496248e38dfd.pdf
    • https://cdn.shopify.com/s/files/1/0435/6374/5441/files/schedule_a_form_1040_year_2018.pdf
    • https://cdn.shopify.com/s/files/1/0433/7732/8278/files/putijop.pdf
    • https://cdn.shopify.com/s/files/1/0431/7036/5602/files/1196392824.pdf
    • https://cdn.shopify.com/s/files/1/0428/4314/4355/files/gosiselurufoni.pdf
    • https://cdn.shopify.com/s/files/1/0432/3059/3192/files/pozimogut.pdf
    • https://cdn.shopify.com/s/files/1/0432/6991/4782/files/86616447288.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062ff.bin
b4c87931211a2f2098e01685d86921907f59f8548f1f121eca3dc80ca47ce158		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62FF 5760 bytes
font_01_sfnt_off00007676.bin
166a0ddd6dd607d5a88e4f33c94e6d8f32c9309ba056048851dbe86a45c3bd57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7676 10384 bytes
font_02_sfnt_off00009a4d.bin
9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A4D 16036 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.