Malicious PDF — malware analysis report

Static analysis result for SHA-256 039f9fc22d76ef49…

MALICIOUS

PDF

43.3 KB Created: 2020-10-01 18:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c1826ea9fd8035743acbd0cc5d74acab SHA-1: 615ea135ea7bb8db13c67673ebb4dae1e7454c4f SHA-256: 039f9fc22d76ef49fba59d1d7383eb2b3bc9c0aa509a03848f7b92e67ac6948e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to external PDF files, many of which are hosted on disposable domains and appear to be part of a link farm. One URL is identified as a known malicious redirector. This suggests the document is used to drive traffic to potentially malicious or spam content, likely as part of an SEO poisoning or phishing campaign.

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://cctraff.ru/strik?keyword=kampala+city+map+pdf In PDF document text
    • http://sukikame.chickenheavenonearth.com/uploads/1/3/0/7/130740609/xudad-tomofula-riwolozar.pdfIn PDF document text
    • http://files.envisiononeness.com/uploads/1/3/1/3/131397955/4393308.pdfIn PDF document text
    • http://zosiremi.rescuedratadoptions.com/uploads/1/3/0/8/130813458/mufizitovajubuwodoga.pdfIn PDF document text
    • http://files.rudhdubh.com/uploads/1/3/0/7/130775431/kixab.pdfIn PDF document text
    • http://files.habitathawaiiisland.org/uploads/1/3/0/7/130775892/giganikogim_siwozujolupu.pdfIn PDF document text
    • http://kugivivog.ritecookware.com/uploads/1/3/1/4/131453960/f43badd.pdfIn PDF document text
    • http://sitog.comalcountybar.com/uploads/1/3/1/4/131454143/mupeduxejafus-foxuki.pdfIn PDF document text
    • http://files.congregationbethshalom.net/uploads/1/3/1/4/131437984/1897289.pdfIn PDF document text
    • https://site-1036680.mozfiles.com/files/1036680/62241764142.pdfIn PDF document text
    • https://site-1036996.mozfiles.com/files/1036996/bedomirafotenovejematupo.pdfIn PDF document text
    • https://site-1036957.mozfiles.com/files/1036957/88090560432.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/30e565a4-e37f-42bd-a593-f5819d5059bc/xagotitolivekototovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/903354e0-e9fe-4199-99fe-8c8a13c5fdfb/24969179083.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8f38686-73a9-4df0-a60d-18d30cda841e/67866406549.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6c3e734-6ac4-4156-913b-543d35847bf6/siletele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fb2bca3-719b-4b0c-9dba-e189854261aa/83424229767.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_off0000622a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x622A 5100 bytes
SHA-256: cbc2b6c0854388cd592212ce6b1a833e8bcfa724d16e70849d71b89a53170bc2
font_01_sfnt_off0000738b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x738B 14308 bytes
SHA-256: 5ab15f6daf20f207bc12ebb644ed83de4d17c9dfa25c138bf26ca9d6a0a5ad9f

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