Malicious PDF — malware analysis report

Static analysis result for SHA-256 35eaaba2e3f5a3c1…

MALICIOUS

PDF

43.0 KB Created: 2020-09-01 00:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4138aad8c24a49dbe9202023247e399 SHA-1: 6f2aff11cd96ec85ab5856bf6fe47a4b9c3a1b12 SHA-256: 35eaaba2e3f5a3c1e0d5f20a908090d531ffb99d2f6f11dab777ae8e82bc4ed7
150 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious URL, disguised as a file conversion service. This is further supported by heuristics indicating a malicious redirector and a link farm, suggesting an attempt to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=convert+file+%25E1%25BA%25A3nh+pdf+sang+word
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/cause_and_effect_matching_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lawup.pdf
    • https://cdn.shopify.com/s/files/1/0434/7143/7984/files/99240367705.pdf
    • https://cdn.shopify.com/s/files/1/0435/4709/9290/files/physiology_of_human_respiratory_system.pdf
    • https://cdn.shopify.com/s/files/1/0435/3504/0664/files/nexo_causal_derecho_penal.pdf
    • https://cdn.shopify.com/s/files/1/0460/7324/9956/files/ayatul_kursi_shia.pdf
    • https://cdn.shopify.com/s/files/1/0434/4440/4374/files/fetexigululoro.pdf
    • https://cdn.shopify.com/s/files/1/0447/7802/9213/files/tegopesowu.pdf
    • https://cdn.shopify.com/s/files/1/0463/8156/4059/files/blank_page_png.pdf
    • https://cdn.shopify.com/s/files/1/0432/6172/2788/files/51268723335.pdf
    • https://static.usrfiles.com/ugd/b8c837_6cd485b0c68a401d952a3ca991841d71.pdf
    • https://static.usrfiles.com/ugd/e33828_60326d0a66c340989ec85c123ae2295a.pdf
    • https://static.usrfiles.com/ugd/33ab24_a142c9b4e4134e83a415c3007b77f8aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_6821137c406144e4a16a979c4c63d974.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_off000057e8.bin
6b83d8dfcc380cac1bbce6efbb2aac26713477c8af46d0714d2ec9aa7525e1be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57E8 5532 bytes
font_01_sfnt_off00006a34.bin
9479731daba278ce54995e20882747c4687a6f17860ece3487bc9bd3e0adbc71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A34 11420 bytes
font_02_sfnt_off00008f1e.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F1E 4324 bytes

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