Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ac619144d0fd1d…

MALICIOUS

PDF

45.1 KB Created: 2020-08-10 01:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e68ad9be471a00f55f2887647723dcd SHA-1: 75a2dddcb5ea89b89a5d749a1c45aeecd973e356 SHA-256: b7ac619144d0fd1d7011288ddeaba6d84a6b65c89cd075b1548e85944ccb0dc4
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to PDF bookmarks and includes the malicious URL. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites.

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=how+to+make+bookmarks+in+nuance+pdf
    • http://files.parttimewanderlust.com/uploads/1/3/0/9/130969548/nowisukikigof.pdf
    • http://files.hmongunited.org/uploads/1/3/0/8/130874009/pomedojesenokukafov.pdf
    • http://files.kangarooislandskincare.com.au/uploads/1/3/1/4/131406068/rajemeroxegizox.pdf
    • http://files.priscilajamison.com/uploads/1/3/2/7/132711961/rerusedivedude.pdf
    • http://files.mpumcbuilders.org/uploads/1/3/1/4/131406403/titazijubo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9845/5705/files/catgut_cromico.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/parisibudipaxetiwori.pdf
    • https://cdn.shopify.com/s/files/1/0435/7606/6211/files/67222304074.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/20584411917.pdf
    • https://cdn.shopify.com/s/files/1/0432/5729/9097/files/jdk_8_new_features.pdf
    • https://cdn.shopify.com/s/files/1/0433/7955/6504/files/30790408717.pdf
    • https://cdn.shopify.com/s/files/1/0434/7599/2728/files/68165591673.pdf
    • https://cdn.shopify.com/s/files/1/0432/9318/0070/files/vunokaxefakovovalosin.pdf
    • https://cdn.shopify.com/s/files/1/0433/2388/3688/files/48816379817.pdf
    • https://cdn.shopify.com/s/files/1/0434/7658/2552/files/xujuno.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/wutakulo.pdf
    • https://cdn.shopify.com/s/files/1/0454/3355/3054/files/renfe_billete_movil.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_off00006383.bin
491a02a9f709a5d8fa93e14a699b5276bc4e35f67d1319f3088392ad6180eaef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6383 5408 bytes
font_01_sfnt_off000075d3.bin
4b934b656f3fd1b0291f71c64760a92cb50868fab3ba772cb3a68755871593c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D3 10352 bytes
font_02_sfnt_off00009928.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9928 4324 bytes

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