Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c8c68da6d785a4…

MALICIOUS

PDF

38.4 KB Created: 2020-08-30 11:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36fe96902b02718eba1e590c2cfa78a7 SHA-1: bce32153a89aa801e4ec010fd5485867bfb073ed SHA-256: 95c8c68da6d785a4a97419a5c6247cc1bb84d8a66a9a98e06a1dc47aa45229bd
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.me/wix?keyword=the+smartest+guys+in+the+room+audiob', which is also listed as a malicious redirector. Additionally, the file exhibits characteristics of a link farm, with numerous embedded URLs, suggesting a broad attempt to direct users to potentially harmful 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.me/wix?keyword=the+smartest+guys+in+the+room+audiob
    • https://static.usrfiles.com/ugd/b8c837_8a65298334da4510b6ed68a339334389.pdf
    • https://static.usrfiles.com/ugd/1b8612_28ce6bfc278442fd8f4d724abd1fcb48.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6b032325d904897bf9cf1e87d7ac8a1.pdf
    • https://cdn.shopify.com/s/files/1/0434/0491/8941/files/teaching_emotions.pdf
    • https://cdn.shopify.com/s/files/1/0435/7403/4600/files/40083663054.pdf
    • https://cdn.shopify.com/s/files/1/0435/8694/5187/files/petejekafalizoz.pdf
    • https://cdn.shopify.com/s/files/1/0441/3086/1208/files/bad_deadlift_form_gif.pdf
    • https://cdn.shopify.com/s/files/1/0439/8268/4318/files/76966109127.pdf
    • https://cdn.shopify.com/s/files/1/0433/7729/5516/files/31293473157.pdf
    • https://cdn.shopify.com/s/files/1/0431/0928/6050/files/62496442344.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/dolphin_emulator_old_version_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0428/2266/4348/files/75520077525.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/16171384601.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5451/files/jesedizijivepojup.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_off00004b40.bin
ae388bca36e51cb65aa45895c0999c69e59e854d8d144483466d7eaa0c9558ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B40 5280 bytes
font_01_sfnt_off00005d0d.bin
9ad3ac4198faec71c3277cd4f6ecf9a52513ec2fa43f60bdc2e1fac4cd7f9944		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D0D 9776 bytes
font_02_sfnt_off00007e65.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E65 4324 bytes

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