Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d8c99aa381de1e…

MALICIOUS

PDF

40.3 KB Created: 2020-09-01 03:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c85288cefbbd7b6462128250d27ccb7c SHA-1: 3bbe7d3d56ec03b7e5560a4a546860950bb35015 SHA-256: d6d8c99aa381de1e81790e4fcd1890ee30ac050b44b844612b5814ffc663b7a5
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 it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs. The primary malicious URL identified is https://ttraff.club/wix?keyword=definition+of+formalism+approach, which is likely used to redirect users to further malicious content. The presence of many benign-looking Shopify links suggests an attempt to camouflage the malicious redirector.

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.club/wix?keyword=definition+of+formalism+approach
    • https://cdn.shopify.com/s/files/1/0434/0046/2503/files/agency_cost.pdf
    • https://cdn.shopify.com/s/files/1/0432/4343/8244/files/50762071665.pdf
    • https://cdn.shopify.com/s/files/1/0437/2129/3974/files/run_android_apps_linux_mint.pdf
    • https://cdn.shopify.com/s/files/1/0431/6482/7805/files/51375160974.pdf
    • https://cdn.shopify.com/s/files/1/0446/7975/7977/files/roots_2_fairy.pdf
    • https://cdn.shopify.com/s/files/1/0427/4972/2790/files/allotropes_of_carbon_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/9178/7937/files/xigafekimosa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7742/5565/files/90739737806.pdf
    • https://cdn.shopify.com/s/files/1/0431/3835/1255/files/adrenal_insufficiency_pediatrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/gazejeniwivedipiwe.pdf
    • https://cdn.shopify.com/s/files/1/0451/8638/4023/files/15763429389.pdf
    • https://static.usrfiles.com/ugd/eb6612_3f4504dc4c854d4cbbd43d58ce2e5e1c.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_c00674c88c3e410cb3874402157105e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_fba2452068a84ca7a8008921feeaa2fe.pdf
    • https://static.usrfiles.com/ugd/8acad3_a1a036a4fe544184a463488d08163d87.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000609b.bin
859b8a7549b7b40e85bccbb3d63b6b395d022e2851efcf443ab068b0f9132563
pdf-font-stream PDF embedded font (sfnt) at offset 0x609B 5252 bytes
font_01_sfnt_off00007250.bin
db4eadf79ac102b5485b978f7282fb0d2762122869d72103200058c6ff4c707a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7250 9976 bytes