Malicious PDF — malware analysis report

Static analysis result for SHA-256 f021fb18fcc6ea6c…

MALICIOUS

PDF

39.6 KB Created: 2020-08-28 21:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2394c70f6f87d395e6fc96f057ad12dc SHA-1: 078f0d251fede765a6ea3fe5873622a1cc948791 SHA-256: f021fb18fcc6ea6ceedb7cf8f752d55ddbe1665ed8cbcc762b7d52963c68f9af
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate search results for "Html tutorial pdf download free". The primary link, https://ttraff.ru/wix?keyword=html+tutorial+pdf+download+free, is identified as a malicious redirector. The document's structure and embedded links suggest a social engineering tactic to drive traffic to malicious infrastructure, likely for further exploitation or malware delivery.

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=html+tutorial+pdf+download+free
    • https://cdn.shopify.com/s/files/1/0434/5511/9513/files/35733942329.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2214/files/39790549941.pdf
    • https://cdn.shopify.com/s/files/1/0434/6055/9013/files/96725514631.pdf
    • https://cdn.shopify.com/s/files/1/0437/1605/1112/files/20161883395.pdf
    • https://cdn.shopify.com/s/files/1/0435/9405/5843/files/cash_flow_statement_practice_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/7554/1919/files/relational_database_example.pdf
    • https://static.usrfiles.com/ugd/b8c837_15b571ccc55447868505cbab9e834b35.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd9d5ca1546f425fb01233295b19e73b.pdf
    • https://static.usrfiles.com/ugd/b8c837_4163bf30943147c6a16d8248eb7af845.pdf
    • https://static.usrfiles.com/ugd/b8c837_3192a14a0fbe4f5593de9274581fa9d7.pdf
    • https://cdn.shopify.com/s/files/1/0433/9594/0519/files/gapovo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5382/6726/files/cv-_2000_duck.pdf
    • https://cdn.shopify.com/s/files/1/0436/0932/5730/files/faregojotokaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/6400/8605/files/nes_emulator_apk_for_android.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_off00005e09.bin
7f8866a8e961e05e3b57b0c8d39e8f4ea8d7a280bc8963891a7e5bb9989dafba
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E09 5064 bytes
font_01_sfnt_off00006f3e.bin
b872b886c25a67602ed83c994921dcf1da89bf46382f01ed6f6bd7be660baf55
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3E 10192 bytes