Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e372e49421fb52…

MALICIOUS

PDF

40.4 KB Created: 2020-08-18 21:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f76b9945f562ff0d939e85b6b6359a2e SHA-1: 8cff6850e4738dfe1632d0af742131255284e9b9 SHA-256: 09e372e49421fb520f650a715a3b688b38603d402a08a850276b1c43c2d3f2f2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF documents. One URL, 'https://ttraff.ru/pify?keyword=uniforme+atletico+san+luis+dream+league+soccer', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness, suggesting the document's primary purpose is to lure users to malicious sites or engage in SEO manipulation.

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=uniforme+atletico+san+luis+dream+league+soccer
    • http://files.michellelsnyder.com/uploads/1/3/1/4/131437385/4823274.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8125/2507/files/pimigemugulajep.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/27977317352.pdf
    • https://cdn.shopify.com/s/files/1/0430/6049/4485/files/nozidojawezugobof.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/overwatch_chat_commands.pdf
    • https://cdn.shopify.com/s/files/1/0435/3549/9418/files/60658984945.pdf
    • https://cdn.shopify.com/s/files/1/0440/9422/6584/files/15468276993.pdf
    • https://cdn.shopify.com/s/files/1/0429/8683/2035/files/labesanoto.pdf
    • https://cdn.shopify.com/s/files/1/0432/6073/9752/files/android_republic_toram_vip.pdf
    • https://cdn.shopify.com/s/files/1/0447/9080/8727/files/real_estate_bpo_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/4153/7696/files/26516478442.pdf
    • https://cdn.shopify.com/s/files/1/0430/2431/8618/files/64432855927.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fa9.bin
fc5e4b6e58981b6ece3f90be5487c8c5a604102552b4d8a4b6e6f2f7db935046
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA9 5332 bytes
font_01_sfnt_off000071a5.bin
52b06a64f32d76a34127ed11acc67023614328a3e717519884c1c4aded3c4edf
pdf-font-stream PDF embedded font (sfnt) at offset 0x71A5 10280 bytes