Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b02540baa9358f…

MALICIOUS

PDF

36.1 KB Created: 2020-08-14 13:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfa184bf4aa671349ab5d86d228f01bb SHA-1: 27266f790ef95eda8ad12ecf3a195fa71d420e3a SHA-256: c4b02540baa9358f1a46bb8b048123b7a42a68f0ddbd9e4b3db942bdbbbafcdc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. The primary malicious indicator is the redirector URL, which likely leads to a phishing page or malware download.

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=lagu+basing+kadak+full+album
    • http://files.schoolhouseportal.com/uploads/1/3/0/8/130813730/9e5dd74a9.pdf
    • http://sobepegep.pontotoctitans.org/uploads/1/3/0/7/130775075/cf2ad45f450c7c.pdf
    • http://files.styersconcreteandconstruction.com/uploads/1/3/1/8/131856290/mumugesemige_guwovibebarigog_waxemidoxiveku_lexawol.pdf
    • http://files.kefinancials.com/uploads/1/3/2/6/132681836/9153339fe35b8a3.pdf
    • https://cdn.shopify.com/s/files/1/0434/2362/9477/files/2319467664.pdf
    • https://cdn.shopify.com/s/files/1/0438/9981/4056/files/vazeperefagosej.pdf
    • https://cdn.shopify.com/s/files/1/0430/9529/4105/files/lepanutujuxixepurifuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98455436519.pdf
    • https://cdn.shopify.com/s/files/1/0432/1384/8731/files/27841960107.pdf
    • https://cdn.shopify.com/s/files/1/0429/2745/6419/files/aorus_app_center.pdf
    • https://cdn.shopify.com/s/files/1/0429/9387/7145/files/a_catholic_introduction_to_the_bible_the_new_testament.pdf
    • https://cdn.shopify.com/s/files/1/0430/7160/2855/files/topazi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuvekalododit.pdf
    • https://cdn.shopify.com/s/files/1/0431/3314/1149/files/25993540778.pdf
    • https://cdn.shopify.com/s/files/1/0430/8346/4855/files/medical_dictionary_online.pdf
    • https://cdn.shopify.com/s/files/1/0437/1569/0650/files/bukhari_sharif_bangla_book_download.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_off00004f35.bin
88489616529340d5a58266edb8060774cdb00b19fef73da87e4e273740d34e06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F35 5276 bytes
font_01_sfnt_off00006118.bin
00d652f5e28f698f5f18ff97f34122d70612b92550ecd9f5d4a7161ea7a7861d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6118 10100 bytes

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