Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4198da8c3172578…

MALICIOUS

PDF

62.0 KB Created: 2020-09-01 08:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be5811ca8ac2871e2fff412dd78ac9b7 SHA-1: dd7c877f97847c330d0523f0514701681bbd52b4 SHA-256: c4198da8c3172578b38ceabcdeb27286ddf7e231181ca1aefda4113c5fcc6def
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=apache+open+office+free++64+bit'. This URL is presented within the document body, likely as a lure for users seeking software downloads. The presence of a large number of external PDF links further suggests a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • 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=apache+open+office+free++64+bit
    • https://static.usrfiles.com/ugd/d4a9d6_2d7a943040884f6d998e69998c4f253f.pdf
    • https://static.usrfiles.com/ugd/b8c837_927c2bf494ff478d8ebdfe818e39c2e7.pdf
    • https://static.usrfiles.com/ugd/5bb01c_4246749f410b4e0981f01b51f4e7fbcc.pdf
    • https://static.usrfiles.com/ugd/12daa7_f656ac1405bf422eafd25d62fea661cb.pdf
    • https://static.usrfiles.com/ugd/5be868_3ba494b24a1941d4bac099208f7bbdb6.pdf
    • https://static.usrfiles.com/ugd/b8c837_d160ce30a08f43b8a5703c44dd9143de.pdf
    • https://static.usrfiles.com/ugd/b8c837_00b3d5b5938c44d1b04ac96dc5199399.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_27bfbd6805b343fcbc5617f8ed7ac149.pdf
    • https://static.usrfiles.com/ugd/6924eb_a5a33ea2913f4a24a0f472f233df5963.pdf
    • https://cdn.shopify.com/s/files/1/0461/0926/1987/files/rpg_maker_mv.pdf
    • https://cdn.shopify.com/s/files/1/0431/0840/1316/files/template_diagrama_de_causa_e_efeito.pdf
    • https://cdn.shopify.com/s/files/1/0431/5486/6333/files/consumer_reports_best_used_vehicles_under_20000.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/21286066848.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/xixusepategiturutifa.pdf
    • https://cdn.shopify.com/s/files/1/0439/3949/6094/files/zixizug.pdf
    • https://cdn.shopify.com/s/files/1/0437/7001/9998/files/36021779013.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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066c9.bin
4aaeb30114d05108cd743bfd6c94d2e18471ffdacf9a9451f0d290d691350f9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66C9 5004 bytes
font_01_sfnt_off0000786c.bin
fe863a4037ccde70781994ff4d18a4cdbd1ed818198c8f298a904fa9b2703e13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x786C 5264 bytes
font_02_sfnt_off00008a4d.bin
1620336da6018abf771a3b64a4739dbc5cc5761e5bcfd31f9568e9163b5e6178		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4D 2656 bytes
font_03_sfnt_off0000954e.bin
d65353c1e58b8117dba3b6111dc10a97bd845c7ddcedb9792c302b0022a08e3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x954E 5032 bytes
font_04_sfnt_off0000a4b8.bin
c8cb303e765c67f43d6d34f29c1d02953890772ff7b697be779fb29335000f72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4B8 6640 bytes
font_05_sfnt_off0000b657.bin
891520638cbb844098b5c00ab243471cd09b41ea7db987bd4b1a00d013f6183a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB657 11584 bytes
font_06_sfnt_off0000dd7e.bin
ab0b30550c16f0218ea180a56450acc25083be48fb805cb0f6f475dfa13b8319		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7E 2832 bytes

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