Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f354c7276583923…

MALICIOUS

PDF

62.2 KB Created: 2020-08-09 21:40:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7840e2978ce367d812bda079ebf68a68 SHA-1: eebf3828797c2dee35f0808a9cac25dd42ee3945 SHA-256: 0f354c72765839236f8b084d8a7a35adf74a5e559058004882332362eb016345
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, suggesting an attempt to manipulate search engine results or distribute content. One critical heuristic identified a link to a known malicious redirector at `https://ttraff.ru/pify?keyword=elchuri+ayurvedam+books+in+telugu+pdf+download`, indicating a malicious intent to redirect users to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious.

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=elchuri+ayurvedam+books+in+telugu+pdf+download
    • http://parexa.diypaintguy.com/uploads/1/3/0/7/130775734/kirajimivo_dasotefez_firulomiwuv_pinudulebuz.pdf
    • http://bazas.cartoonsonfilm.info/uploads/1/3/2/6/132695615/b741846211424c4.pdf
    • http://files.olympiamarines.org/uploads/1/3/1/1/131164272/6420212.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/jomowimu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6701/4297/files/affinity_designer_workbook_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6479/5044/files/tebaxoradigutabisazedipu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9866/9220/files/23708897435.pdf
    • https://cdn.shopify.com/s/files/1/0429/9377/8837/files/wanekilipevak.pdf
    • https://cdn.shopify.com/s/files/1/0438/2585/6669/files/13449507730.pdf
    • https://cdn.shopify.com/s/files/1/0432/5136/8104/files/learn_java_programming_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4049/files/48359854952.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7207/files/mubojopejesurelepe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9546/files/adjectifs_possessifs_exercices_franais.pdf
    • https://cdn.shopify.com/s/files/1/0427/7128/4135/files/zojuzug.pdf
    • https://cdn.shopify.com/s/files/1/0434/7510/7990/files/80348445436.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b49.bin
c273ba673fdaddbbde50208683f95a74c42a38004aca992078fae377a7eaf606		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B49 5984 bytes
font_01_sfnt_off00009f97.bin
9511175593d5e2954574fa1cca7ac030cf5c42ff7e28d60ca2e2645bd8b077f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F97 7244 bytes
font_02_sfnt_off0000b6b1.bin
a511fb262e2f240b0cc62b800179189f1c69c7b4d67d938f9bc0c5e12ef74554		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B1 2024 bytes
font_03_sfnt_off0000c046.bin
958d9b9c74d85a3884f9323c41123f15ab5d16cb673cad2767b38700a828c1fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC046 13244 bytes

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