Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba27535ff33b3a7…

MALICIOUS

PDF

44.6 KB Created: 2020-08-31 03:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f531b94e8a80898f7f65223d956604e1 SHA-1: 2b3cab7347257e7fb1e71a223aa646416b5a1786 SHA-256: 1ba27535ff33b3a7a0487bd3696ea9575731420a805ae542f7fa8c65ea0dcaf9
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=texte+au+pass%25C3%25A9+compos%25C3%25A9'. Additionally, it exhibits a PDF link farm behavior, embedding numerous links, with the first identified as 'https://cdn.shopify.com/s/files/1/0437/0907/1513/files/yakuza_kiwami_doctors_duty.pdf'. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the same malicious URL and several Shopify URLs, suggesting a lure to external content.

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=texte+au+pass%25C3%25A9+compos%25C3%25A9
    • https://cdn.shopify.com/s/files/1/0437/0907/1513/files/yakuza_kiwami_doctors_duty.pdf
    • https://cdn.shopify.com/s/files/1/0431/4988/5606/files/formal_dress_shops_spanish_fort.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8383/files/83056488605.pdf
    • https://cdn.shopify.com/s/files/1/0435/0902/2886/files/wimibupab.pdf
    • https://cdn.shopify.com/s/files/1/0434/2621/8136/files/34168098598.pdf
    • https://static.usrfiles.com/ugd/b8c837_5281e1bfd0ea43fa8091cbaade2a9dbc.pdf
    • https://cdn.shopify.com/s/files/1/0432/3839/1970/files/78198845203.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71061356311.pdf
    • https://cdn.shopify.com/s/files/1/0431/7963/8942/files/gipix.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/godudalopasof.pdf
    • https://static.usrfiles.com/ugd/7dd30d_3c326c9ced2c45248f240239fd1039ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2c6507a5dcc4a65bbaeabdc62ae5042.pdf
    • https://static.usrfiles.com/ugd/99965f_c3c11d66ae2f4016a37a1ebec549336b.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb642f2e8f87472d92571b067a601cef.pdf
    • https://static.usrfiles.com/ugd/87d215_0d8a19ff12b94eaba6c6277154cc370d.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_off000064ff.bin
879d96870930840630c18825259c6f8402e47868f657dba879141d46a3ddd484		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FF 5108 bytes
font_01_sfnt_off00007605.bin
4136b31b372b11a81e874cc1ffe57ab26600a3b71d681fd166310670f407705f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7605 1740 bytes
font_02_sfnt_off00007e83.bin
3ce2cefa84a3168c0158f32ee4e729a73ca18595b6d5bde9bfab0e37e951468d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E83 11668 bytes

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