Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a562cc99a22cc54…

MALICIOUS

PDF

45.8 KB Created: 2020-08-31 05:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 366520edc7d9ac57788a925ae5f67e1e SHA-1: cdb3c8331576189239b0da485356da94c82a2cf7 SHA-256: 9a562cc99a22cc542fcccf80306c147c16f25d6faf05cf535608c3aea0e51ffd
152 Risk Score

Malware Insights

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

The PDF was flagged for containing a malicious redirector link and a large number of external links, indicating a link farm. The primary malicious URL identified is https://ttraff.ru/wix?keyword=2016+jeep+rubicon+reviews. The document body contains garbled text but includes the same keyword as the malicious URL, suggesting a lure. The presence of numerous benign-looking PDF links alongside the malicious one is a common tactic to obscure malicious intent.

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=2016+jeep+rubicon+reviews
    • https://static.usrfiles.com/ugd/0049ca_02a770dd5e4045cea651452c50cd94ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_a76236dc6014450881049cea60c599ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_0992f025c53541fca04e5c472a853b50.pdf
    • https://static.usrfiles.com/ugd/fbccce_196e401b034340deaf1533cd37bfc9c3.pdf
    • https://cdn.shopify.com/s/files/1/0439/4778/6398/files/factor_analysis_articles.pdf
    • https://cdn.shopify.com/s/files/1/0431/0066/8065/files/vemira.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6001/files/pirofiwagenafidoxisirub.pdf
    • https://cdn.shopify.com/s/files/1/0463/2533/4171/files/adobe_reader_xi_offline_installer.pdf
    • https://static.usrfiles.com/ugd/b8c837_796876de88fd40fba1d728efb3eaeb1d.pdf
    • https://static.usrfiles.com/ugd/625844_e8f410842068486ea19f7041653c42b1.pdf
    • https://static.usrfiles.com/ugd/2274a7_83ec483d10374525b8843bc747567008.pdf
    • https://static.usrfiles.com/ugd/b3bc21_c890696538a845aaab9342d5012c5e27.pdf
    • https://cdn.shopify.com/s/files/1/0437/6225/3982/files/mumamefebevasu.pdf
    • https://cdn.shopify.com/s/files/1/0440/2708/4965/files/tafisox.pdf
    • https://cdn.shopify.com/s/files/1/0438/4695/9261/files/non_stop_air_supply_songs.pdf
    • https://cdn.shopify.com/s/files/1/0429/6985/8214/files/ajay_yadav_anesthesia_download.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_off0000682e.bin
319ff7ee409b9ccb04de130bc85108c4f0ccb71dd816cfb0ea5a9bd007dda0d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x682E 5240 bytes
font_01_sfnt_off00007a05.bin
4dad4211f8cdec49414b230c2ba32fadec3c2363906927871f3bc85469004b52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A05 9900 bytes
font_02_sfnt_off00009bae.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BAE 4324 bytes

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