Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bac305c1266bb2b…

MALICIOUS

PDF

84.8 KB Created: 2020-08-07 07:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c34f3195854d4cdd0a590edc16cdca2 SHA-1: 4d912269f1e632efbce61e0f96fae9d495da0fd1 SHA-256: 5bac305c1266bb2bbc9e84392e2000cd82a12df1a05f71e62f4d50f341719647
154 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure for downloading a book, which is then linked to a malicious URL. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, further supporting the malicious intent of redirecting users to potentially harmful content.

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.com/pify?keyword=cbse+class+11th+maths+book+pdf+download
    • http://kopob.wheretonext-explore.com/uploads/1/3/1/3/131379730/giwalixatijadariz.pdf
    • http://files.trnsetters.com/uploads/1/3/1/3/131379680/ba5bd971f7b.pdf
    • http://files.ryswint.com/uploads/1/3/1/3/131379320/94831fe2f8c.pdf
    • http://files.safelysweettreats.com/uploads/1/3/1/0/131070356/fisikolaxo.pdf
    • http://gosowopix.ssenglishbulldogs.com/uploads/1/3/0/7/130740596/2980265.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2161/5775/files/72058548475.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9462/files/divew.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3917/files/tanatologia_catolica.pdf
    • https://cdn.shopify.com/s/files/1/0429/5576/7967/files/59652791603.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5193/files/rimeseloxuros.pdf
    • https://cdn.shopify.com/s/files/1/0429/6835/0873/files/99881348791.pdf
    • https://cdn.shopify.com/s/files/1/0437/3489/2693/files/7903927195.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/zifoworepogi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2265/4362/files/44702861542.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/telisupuf.pdf
    • https://cdn.shopify.com/s/files/1/0449/3754/3848/files/ios_launcher_kukool_launcher.pdf
    • https://cdn.shopify.com/s/files/1/0439/9936/3222/files/bojitafemeze.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9b8.bin
2a318f21f15107c61308c4687f54bc530f4ee6e6de5664a32f940eb5dc8109b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B8 21372 bytes
font_01_sfnt_off0000fd22.bin
af9875268051d88389cf2e6fd174aeb3d731c024799c96a91a55ff828a7e9bd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 5552 bytes
font_02_sfnt_off00010fef.bin
5c735c0ad44fa0b20ab01297fee3c7e5204ca470d4af134ca5bdcdec68642bab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEF 17104 bytes

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