Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc1b102852cea12…

MALICIOUS

PDF

49.5 KB Created: 2020-11-09 15:06:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9817bee538e8748800e05b320ceeb843 SHA-1: 77829e0a2ebebd2b3e35943b943a9a1e24a0a414 SHA-256: fdc1b102852cea1238403c517d11682ca21ef44ebe5c91cf609b68ef4ae1bd69
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating it's a malicious redirector link farm. One of the primary links, 'https://ggtraff.ru/123?keyword=aria+of+sorrow+rom+download', is flagged as malicious. The document body, though heavily obfuscated, contains references to this URL and appears to be a lure for downloading content. No scripts were extracted, but the structure suggests an attempt to redirect users to malicious or unwanted content.

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/123?keyword=aria+of+sorrow+rom+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408704/normal_5f9c2b8f9fdd1.pdfIn PDF document text
    • https://sosegesidor.weebly.com/uploads/1/3/4/4/134465043/vetuziputonalekutezi.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/c2926e035a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/fb228f95-4042-45ea-ba25-603829a24330/nivozoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/429f215f-823f-4aaa-880f-0930a488675d/esu_library_hours.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d519d1e2-ee11-4cca-a274-873c433afcaa/29113887255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e70b4a8b-62ec-4cf6-ad60-ca68ed4029d7/sobataxowuzuwelelizefem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c0ea38d-e289-40ba-ade5-1d2fb3949deb/download_milk_and_honey_by_rupi_kaur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2236b6ec-ec96-4691-bcd8-0c28422340f3/fijiredagadabir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da443598-4b42-4408-bfad-378dd11060b8/15700830818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27369f1b-8896-4be7-989b-b5d04ce094ff/25598523628.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6644 6960 bytes
SHA-256: 0ab57f55db3736ccb805fb5fcbc068aa86ec77f0e361e2003cf34c6fd72dce71
font_01_sfnt_off000077e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77E4 4724 bytes
SHA-256: d52ddb76588540107d495e11bf404a6e40f212bb729c71cf3ea2b3f8cccca095
font_02_sfnt_off000087c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87C9 10348 bytes
SHA-256: d0184cbe274100be63f47117e1b9f377d7f0351a8dde372a8175eba951c61752
font_03_sfnt_off0000ab31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB31 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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