Malicious PDF — malware analysis report

Static analysis result for SHA-256 61495651d0961acf…

MALICIOUS

PDF

47.3 KB Created: 2020-08-30 00:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca160a4a64de4e58a2dc31496c19e436 SHA-1: d0cb3df32286f57cf58809a02c6b6fe3a8d52ef0 SHA-256: 61495651d0961acfcc7a46aeeebae738ad3d71a14610b6073b954283d2740fe2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded links, many of which point to PDF files hosted on Shopify. One of these links, https://ttraff.ru/wix?keyword=toyota+rav4+ev, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL and several benign-looking PDF links, suggesting a link farm or SEO poisoning attempt.

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=toyota+rav4+ev
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/0928/6050/files/nawarafimomuni.pdf
    • https://cdn.shopify.com/s/files/1/0437/7011/8306/files/nizixolul.pdf
    • https://cdn.shopify.com/s/files/1/0433/7231/4778/files/usher_here_i_stand.pdf
    • https://cdn.shopify.com/s/files/1/0430/5790/5818/files/wixalozed.pdf
    • https://cdn.shopify.com/s/files/1/0438/2280/9250/files/gosidixokelizibojofigin.pdf
    • https://cdn.shopify.com/s/files/1/0432/2597/2904/files/26844397263.pdf
    • https://cdn.shopify.com/s/files/1/0438/5754/3328/files/79829319358.pdf
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/vetoda.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_a6fbee91620948849402c7c12f82df80.pdf
    • https://static.usrfiles.com/ugd/fa6f14_c0078e80be3340899b30916f467b96ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ffa065eb454449c953c3870047c2576.pdf
    • https://static.usrfiles.com/ugd/d54300_41b2d949c56141c591ccb4dff7aea521.pdf
    • https://static.usrfiles.com/ugd/3826db_2dd59fb977744a3385632f8f7ddf94cf.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_f7eabf0b33a848639b00645c3b4ca4d0.pdf
    • https://static.usrfiles.com/ugd/74c34a_f28a1d7c7e8e42638847379d6aaf9b24.pdf
    • https://static.usrfiles.com/ugd/b8c837_bdc6f285362147cfa31e5fbd468489fa.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fa6.bin
0c0aba118e2ecf2086b26d2cb9d00894e1f7a7d29056d0f522e6d15b95b6d45f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA6 4300 bytes
font_01_sfnt_off00007e51.bin
f60842666f8523c7d8587d367e5c46f7217929f242b55442261f9eb32a58622a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E51 10420 bytes
font_02_sfnt_off0000a20d.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA20D 4324 bytes

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