Malicious PDF — malware analysis report

Static analysis result for SHA-256 e904857696fd13f8…

MALICIOUS

PDF

49.7 KB Created: 2020-10-28 15:58:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5261e085195356a19a16dd0717cdcde4 SHA-1: 564b36846034927e58a13252bdbef880163ae88e SHA-256: e904857696fd13f83c2a51bf178d8561aaeb8981785b95a850430f3e5e4d4515
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF files hosted on various platforms. This indicates a likely attempt to lure users to malicious sites, potentially for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?keyword=peeta+bread+scene In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f93d2e71553a.pdfIn PDF document text
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/7412485.pdfIn PDF document text
    • https://vozutadisifik.weebly.com/uploads/1/3/1/4/131483249/zumenaxaja-jivaj-giluvatuju-kimuti.pdfIn PDF document text
    • https://kogewovedof.weebly.com/uploads/1/3/4/3/134339257/juzaxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368242/normal_5f8838312a333.pdfIn PDF document text
    • https://kesevaze.weebly.com/uploads/1/3/1/3/131383297/sakukasonowi.pdfIn PDF document text
    • https://depufavekozumel.weebly.com/uploads/1/3/4/0/134017714/4a83835a3d21.pdfIn PDF document text
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/9536902.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/6583825.pdfIn PDF document text
    • https://numuxubolab.weebly.com/uploads/1/3/4/3/134382028/jusige_tusugut_mudexizoku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407782/normal_5f9551fa154bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5f98fda7ab1ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbe07e27-f8f9-404d-8cc3-79e31cf9a1f8/zevek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c4535b8-5bac-42cf-8274-9074f9289749/trig_cheat_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50dd012e-f914-41b5-94af-aae02f5d9f72/61524924928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b3676d0-f69f-465b-b8d4-cd4c6fbe4646/xulafajetabov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/137c547d-d727-4c55-af62-529d3d3a0bc8/74172031302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e32702db-e72c-4190-a185-455237b63c9e/51315710720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a96fcfd8-3952-4b44-b4e3-1761513f075a/44024413306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/713767fb-2e81-4a4d-a704-f3c7579642b6/42387495004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3ce416b-457c-4783-a0c7-276c9aee6126/a_history_of_art_in_africa_2nd_editi.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71FB 5044 bytes
SHA-256: 50f12cc90ff1269adf96223318c63088a525181bf537e9693366bca368dd00ad
font_01_sfnt_off0000831c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x831C 6176 bytes
SHA-256: b4e439eddd7602406ba50698ff936bfd62217329f53630650c47f4be8e47526f
font_02_sfnt_off00009333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9333 10632 bytes
SHA-256: 67c0a2a24918c722e4a2477d8137b1712fb5b7e5363e96c9067c503a7aef3d31