Malicious PDF — malware analysis report

Static analysis result for SHA-256 3014308aad75b37b…

MALICIOUS

PDF

42.8 KB Created: 2020-09-01 04:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e27467af3d90a0d4a1feabd480763d42 SHA-1: 9dfe163e32af3212cd207a6f0b6fc3d4280cd4aa SHA-256: 3014308aad75b37b711d0a1310f30566c72e08a5580880ea98b8d19ebf888a93
154 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, specifically pointing to 'https://ttraff.ru/wix?keyword=free++whatsapp+status+app'. This URL is presented within the document body, suggesting a social engineering lure to trick users into clicking it. The PDF also contains a large number of external links, many pointing to static.usrfiles.com, which is flagged as a link farm. The ML classifier also strongly indicated maliciousness.

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=free++whatsapp+status+app
    • https://static.usrfiles.com/ugd/a2ebd8_6768f84b99f04752abe3aaafc04134d0.pdf
    • https://static.usrfiles.com/ugd/02beb7_ffffe1b479df4df08e456385625b9310.pdf
    • https://static.usrfiles.com/ugd/22bf55_6e15b4b571134793be6c60fabef6b76c.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b90efcf3d364fdf8a2a72e895831b98.pdf
    • https://static.usrfiles.com/ugd/b8c837_c92483f654da4abebf15557d295bfa6a.pdf
    • https://cdn.shopify.com/s/files/1/0437/9485/8133/files/baby_mature_speed_multiplier.pdf
    • https://cdn.shopify.com/s/files/1/0430/1111/3123/files/44136314271.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7679/files/sql_server_interview_questions_download.pdf
    • https://static.usrfiles.com/ugd/1849a1_d8cf3b8c80d34f2185a9c67500c0aac1.pdf
    • https://static.usrfiles.com/ugd/d902bb_72202ea52848483db716c061ccd81ac2.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_off00006843.bin
72532becd25a7dd7dc6e739524aa6496d9c5b1abcf6d99a14c83578a5974fd1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6843 4924 bytes
font_01_sfnt_off0000790f.bin
4ec3c178b77487524c041b9e2a11a5eaa5c7711938b92c22e0048804d93f63bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x790F 11096 bytes

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