Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5c7b1a1784d585…

MALICIOUS

PDF

33.3 KB Created: 2020-09-30 02:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 57575c17ac04346f2bb87cbb05f25c0c SHA-1: 8a2957ecb3fad169c96e6c25d33af202f85024d9 SHA-256: 8a5c7b1a1784d585f6bbbb90a3cc9708944ed7195b157266b6c92616d65aa8a7
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, ggtraff.ru. The document body, though heavily obfuscated, contains the same URL as a clickable link, suggesting an attempt to drive traffic to malicious infrastructure. 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://ggtraff.ru/strik?keyword=atomistique+cours+complet+pdf In PDF document text
    • http://files.hearthsidegames.org/uploads/1/3/1/3/131398274/8997069.pdfIn PDF document text
    • http://files.spoonfulpdx.com/uploads/1/3/1/6/131637255/3267775.pdfIn PDF document text
    • http://tokugata.cjcsmembers.com/uploads/1/3/1/4/131482950/a93814ff.pdfIn PDF document text
    • http://files.myprecisecosmetics.com/uploads/1/3/1/0/131070588/lebutame.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9058/3453/files/admit_card_ntpc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2156/5084/files/kumirebazolufoze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/xitemumu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5526/6457/files/90579816875.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/jagobamek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1564/3031/files/logotuzuwazaluw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c35ac88f-d634-4016-93ad-956fd89aa2dd/diwepefoparojejazemedupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5de279ab-2f0e-424e-9d1d-473fd489f8e2/71374589958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3c370eb-1f7a-4b79-b2be-d5a72749956e/raderi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d274e96-501a-408c-aaeb-91bc9d10ec16/18278005226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2022fee-0521-4f9e-8378-6c79888169f6/56989386101.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000441e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x441E 5204 bytes
SHA-256: 69dd33c0e6bd40153de7a8c4947efdf0b2e8cd98806a2398a6e1c43a5fd1109f
font_01_sfnt_off000055c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55C1 10068 bytes
SHA-256: 7af6bd3331f5946d972cad845f7ef4416d1d7a8bafa3d2b8648bc252a09d65b5

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