Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3236261d10eec75…

MALICIOUS

PDF

45.1 KB Created: 2020-08-21 23:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 300296cecea147136d6f339327539738 SHA-1: be4b85309208bc3555767a968f73c8a51de0e7a3 SHA-256: c3236261d10eec75df1e08a2b2cbe1f31881ae5a112ac56fc2d11aeca6f74514
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify-hosted PDFs, which is indicative of a link farm designed to obscure malicious destinations. One of the primary links directs to 'ttraff.ru', identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Publication in cv format' and the authoring application 'wkhtmltopdf', suggesting a lure to download or view malicious content disguised as professional documents. 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=publication+in+cv+format
    • http://files.drakeuniverse.com/uploads/1/3/2/6/132695714/1863023.pdf
    • http://files.hungrybeargrazing.com/uploads/1/3/0/7/130739811/2a69b32369009.pdf
    • http://files.alisonreber.com/uploads/1/3/1/8/131871984/gokurufesu.pdf
    • http://files.willowslifestyle.net/uploads/1/3/2/7/132740584/figosojoxo-pitujogutak-nikitozi-paveso.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/metegemekipezafekude.pdf
    • https://cdn.shopify.com/s/files/1/0433/0913/8075/files/77710100698.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/lil_wayne_tha_carter_zip.pdf
    • https://cdn.shopify.com/s/files/1/0435/8003/1137/files/tupabojivop.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3866/files/orthodox_tewahedo_biblical_canon.pdf
    • https://cdn.shopify.com/s/files/1/0439/4768/8091/files/excel_vlookup_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/43951425134.pdf
    • https://cdn.shopify.com/s/files/1/0434/3287/0037/files/25206454945.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3936/files/diwiluwutevavaremomajem.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/sovuwob.pdf
    • https://cdn.shopify.com/s/files/1/0430/8454/6209/files/percy_jackson_graphic_novel_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/2602/2554/files/83972136079.pdf
    • https://cdn.shopify.com/s/files/1/0434/0446/0188/files/binary_code_chart.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006532.bin
acd338a3281749e7cdc07a4494c65165d619b76f171cf96bf5d20732f528c4af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6532 4816 bytes
font_01_sfnt_off0000756e.bin
77b909121fd48198d5614bb53067983d3261223de5c8e25e77bb6448a3df0545		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756E 10580 bytes
font_02_sfnt_off00009992.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9992 4324 bytes

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