Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fcf366f27cec6e…

MALICIOUS

PDF

44.1 KB Created: 2020-08-22 01:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d04cffe1c98052187533df1fa9ea241e SHA-1: 3fecd57cd8b9e7897b9fe74af611a78e91036cd3 SHA-256: 21fcf366f27cec6eb1ab29290bf75c77f06b6b074104c09f04b57abde11f7184
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a heuristic firing for a malicious redirector link pointing to 'ttraff.ru', which is a known malicious infrastructure. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The document body, though heavily obfuscated, contains the same malicious URL and benign Shopify URLs, suggesting an attempt to disguise malicious activity within a large number of links. 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/pify?keyword=babul+ki+dua+video+song
    • http://lukuri.jimpendergrass.com/uploads/1/3/0/7/130775062/sapubofatibo.pdf
    • http://nobosub.smalltimerock.com/uploads/1/3/0/9/130969042/kafovegilurezaxaledi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3427/1126/files/nonuwaromavurun.pdf
    • https://cdn.shopify.com/s/files/1/0437/9341/6349/files/brochure_design_software_free_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0460/1482/4607/files/bloatware_removal_tool_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/2392/4376/files/92003909152.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8178/files/21252199168.pdf
    • https://cdn.shopify.com/s/files/1/0433/6300/8664/files/beauty_salon_logo_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/4061/3286/files/zopugimoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/9643/2021/files/free_basic_english_lessons.pdf
    • https://cdn.shopify.com/s/files/1/0431/8330/8955/files/learn_kathak_dance_video.pdf
    • https://cdn.shopify.com/s/files/1/0440/6562/0118/files/valujonopediwo.pdf
    • https://cdn.shopify.com/s/files/1/0438/0409/8722/files/20730397599.pdf
    • https://cdn.shopify.com/s/files/1/0429/3702/4679/files/venoxowebibodipis.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/
    • https://cdn.shopify.com/s/files/1/0

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005564.bin
d61466f61461b08f3b68db2005ebd57f890dfd63a92d91d8cf03bd84ca209f18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5564 5212 bytes
font_01_sfnt_off0000672f.bin
55206a980daa68e9049f923845db4c0e4c62cd1c60e9d75e1f8d18474836a410		 pdf-font-stream PDF embedded font (sfnt) at offset 0x672F 13792 bytes
font_02_sfnt_off00009325.bin
79757ae837fa224e4673cbf54fcce3de8ba2986640d69969113f35aa94b668b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9325 4388 bytes

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