Malicious PDF — malware analysis report

Static analysis result for SHA-256 a593f920f6b73e22…

MALICIOUS

PDF

49.1 KB Created: 2020-08-29 05:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8478f0a11a2ea6f404d2913577d3301 SHA-1: 86736708d62fe473a5793007d026f522150abd64 SHA-256: a593f920f6b73e22648eb9c5e5fa6c6c827ec0d830b46d8d18ae7d82253b2094
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. This URL is likely part of a phishing or malware distribution chain. The document also contains a large number of embedded links, many pointing to Shopify, which is flagged as a PDF link farm. The ML classifier strongly supports the malicious verdict.

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.cc/wix?keyword=eroticmovies+tv-keeper+ru
    • https://cdn.shopify.com/s/files/1/0438/3955/3696/files/27731853242.pdf
    • https://cdn.shopify.com/s/files/1/0464/0381/3531/files/gamukagakawebovotazuvafa.pdf
    • https://cdn.shopify.com/s/files/1/0428/4078/5062/files/indoor_plants_pictures_with_names.pdf
    • https://cdn.shopify.com/s/files/1/0432/5759/4016/files/batman_arkham_knight_save_game_ps4.pdf
    • https://cdn.shopify.com/s/files/1/0447/9392/1685/files/60660505135.pdf
    • https://cdn.shopify.com/s/files/1/0430/7917/2257/files/despacito_lyrics_video.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/fanigopu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9021/5073/files/10435046215.pdf
    • https://static.usrfiles.com/ugd/b8c837_3aca1ea9cdca4af7a3428690a1f8afa1.pdf
    • https://static.usrfiles.com/ugd/b8c837_f138cd7fbb4b470eb7a06957bac291b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_e93bba4aaf294c8580a8d5815231a183.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082e5.bin
2b484d7987053c5be784147a2e22e670e61d4dd2587e3714e24b70261a734155		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82E5 4952 bytes
font_01_sfnt_off000093ba.bin
0e401c898dc7e98cdbf6f5be62e4cbc3e52401d5ef7ce004620a8f4e37d46ab1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93BA 10652 bytes

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