Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9efc0ae0cd58e38…

MALICIOUS

PDF

40.4 KB Created: 2020-08-07 03:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e64d41aa0b868b650c011af3a370484 SHA-1: 0b983e5d956b25bf114dd31627f560742b5cf713 SHA-256: d9efc0ae0cd58e38109ff56af78c0d326fd27447652789b83622d86cece635ba
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm or SEO poisoning tactic. The primary malicious URL, 'https://ttraff.com/pify?keyword=alphabet+letters+design+pdf', is a known malicious redirector. The document body, though heavily obfuscated, contains this URL and other Shopify-hosted PDF links, reinforcing the attack pattern. The ML classifier also strongly indicated maliciousness.

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=alphabet+letters+design+pdf
    • http://relux.nfspto.org/uploads/1/3/0/7/130775795/fupepixotexexipop.pdf
    • http://files.bonnieblackwell.com/uploads/1/3/1/8/131871605/mevufifak.pdf
    • http://files.yvcjoplin.org/uploads/1/3/0/9/130969080/f1c1979567f135f.pdf
    • https://cdn.shopify.com/s/files/1/0430/4551/9513/files/tewakazeno.pdf
    • https://cdn.shopify.com/s/files/1/0434/2946/2165/files/97692145623.pdf
    • https://cdn.shopify.com/s/files/1/0431/3785/9735/files/mathematical_modelling_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/73108692187.pdf
    • https://cdn.shopify.com/s/files/1/0440/0083/7782/files/31875365414.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5737/files/bituzulolat.pdf
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/20298929098.pdf
    • https://cdn.shopify.com/s/files/1/0436/1181/6099/files/enlace_metalico_ejercicios_resueltos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54183348773.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xozujegemuzudileruzodedus.pdf
    • https://cdn.shopify.com/s/files/1/0434/3712/9895/files/escobar_designs_for_the_pluriverse.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/fozolijiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/61149585306.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_off000053b0.bin
d826e40cf9a937b54d7b24dcbc32f6106d0d4496ab3149fad4f9c60aecbd56e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53B0 5108 bytes
font_01_sfnt_off000064f5.bin
67be498569f24d7b999445793950235a0e9b452c6726d5812672d8cf85005d30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F5 9844 bytes
font_02_sfnt_off000086a1.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86A1 4324 bytes

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