Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ddb944a29c5511d…

MALICIOUS

PDF

40.5 KB Created: 2020-08-11 03:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdcba2beb933ffa783f2b057f9145ed2 SHA-1: b1de86988ab19bd63a134decc344a760e241c8ab SHA-256: 5ddb944a29c5511db679f19ea40346a9c0d0262e4f3b0a0369dfd336a03aae13
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, but one critical link redirects to a malicious domain. This suggests a link farm or SEO poisoning tactic to drive traffic to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The embedded URL is used to redirect the user to a potentially harmful site.

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.cc/pify?keyword=animal+farm+chapter+2+questions+and+answers+pdf
    • http://sejef.folsommusic.com/uploads/1/3/2/6/132682883/2515508.pdf
    • http://files.emilysasia.com/uploads/1/3/2/6/132682040/pusunirewip_favon_jazeso.pdf
    • http://files.kkantoinette.com/uploads/1/3/2/8/132816195/bevovituwo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66083684812.pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/74931192917.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/salmos_hernandes_dias_lopes.pdf
    • https://cdn.shopify.com/s/files/1/0431/3248/5799/files/kojewetipojanoluzojo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3672/8735/files/19543229710.pdf
    • https://cdn.shopify.com/s/files/1/0435/0168/2843/files/42914685410.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/pdf_bhagavad_gita_in_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0430/2811/9706/files/sirizuguvix.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tovunegorudakumuwi.pdf
    • https://cdn.shopify.com/s/files/1/0439/0499/1387/files/coats_tire_machine.pdf
    • https://cdn.shopify.com/s/files/1/0434/5757/7122/files/14432388488.pdf
    • https://cdn.shopify.com/s/files/1/0433/6291/0376/files/function_of_applied_social_science.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1637/files/fotipagag.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1164/files/49718078572.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006089.bin
fdb6fbf52aa91ba0a10a50f206365d27aa608a4942ef386329f0d38b98157d85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6089 5732 bytes
font_01_sfnt_off000073df.bin
456af96b89b1db99ea937da64e67805d32a92ea7f0e04179b61762581838a864		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73DF 9756 bytes

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