Malicious PDF — malware analysis report

Static analysis result for SHA-256 71978b391b62fd56…

MALICIOUS

PDF

53.4 KB Created: 2020-08-09 02:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c85c4de8e0b9b25c3131ad288ea14a3 SHA-1: d1400fb7a6259297bc432a2e552e4b9a2e885537 SHA-256: 71978b391b62fd56edf6a27e191a458286dda75989119e68a276334524091516
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, forming a link farm. One of these links, 'https://ttraff.com/pify?keyword=vaimanika+shastra+book+pdf+in+english', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to drive traffic to malicious infrastructure under the guise of providing a book 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.com/pify?keyword=vaimanika+shastra+book+pdf+in+english
    • http://files.evwordsmiths.com/uploads/1/3/1/4/131453535/tesesilugitudekosox.pdf
    • http://files.galvestonbaycharterfishing.com/uploads/1/3/0/7/130775544/lunulibapijexep.pdf
    • http://files.greenearthtravel.com/uploads/1/3/1/4/131438071/wutopalowes-mofosipifikafil-munuvepepiri-pemubadula.pdf
    • http://files.frictiongloves.com/uploads/1/3/0/9/130969944/tepujelegu.pdf
    • http://nesubi.alanajanebrows.com/uploads/1/3/1/4/131438641/rudaxirefobogejo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/84249930325.pdf
    • https://cdn.shopify.com/s/files/1/0437/7945/7175/files/what_comes_after_trilogy.pdf
    • https://cdn.shopify.com/s/files/1/0433/6127/1959/files/se_425_brother.pdf
    • https://cdn.shopify.com/s/files/1/0433/3951/4006/files/pisemoni.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/46741316775.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofifarigomikidapowokov.pdf
    • https://cdn.shopify.com/s/files/1/0432/2931/5229/files/14958271244.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977390730.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/pikevepo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3904/files/45474991478.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9588/files/wugoxulikowametupaxada.pdf
    • https://cdn.shopify.com/s/files/1/0435/6256/5795/files/28881154733.pdf
    • https://cdn.shopify.com/s/files/1/0431/4896/8090/files/20320102086.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_off000076ed.bin
06ad9324ba6b0180e5d44a0181aca89e793cfb25a7780f4d02cca512ce6dc3d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76ED 5412 bytes
font_01_sfnt_off0000891b.bin
8994954eb7b72e0dafd97d41f4d731cfe94fccef17977a7de11a0421221a9708		 pdf-font-stream PDF embedded font (sfnt) at offset 0x891B 10296 bytes
font_02_sfnt_off0000ac4c.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC4C 4324 bytes
font_03_sfnt_off0000ba4c.bin
c8d555ae7417cf1afe265e81848efe9d51b80ebd7e3c3abad0624ea30b50aa20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4C 3336 bytes

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