Malicious PDF — malware analysis report

Static analysis result for SHA-256 9941c4bc28732e77…

MALICIOUS

PDF

49.0 KB Created: 2020-10-24 09:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 647cbaae3df7f0e7166c26d9f721e322 SHA-1: 2c4e068b9b205d8cbcb46119200014042a049eee SHA-256: 9941c4bc28732e77d930fe51abb4db172f4443f6e893012b5085ad93686fdc85
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The presence of a large link farm suggests an attempt to manipulate search engine results or redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=fdmr+raju+singh In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_5f8848b2702e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368756/normal_5f932b88c91f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5f92f90f42e6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_5f8a19dfdd76f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5f8a26106eaca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f8d71b6a5405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f885d522f622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f886313b5977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379053/normal_5f93a6d512f70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_5f9384708aca6.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/xitipobopi-ruwug-pozovu.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/5820017.pdfIn PDF document text
    • https://wovasemuzusalej.weebly.com/uploads/1/3/1/6/131636629/zupivoramem_kabikise_betezumekevifi.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
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/44df877b-aa61-4b6c-aeb3-7dd07d0cce2d/45992220749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb4483a2-dc67-42a4-979a-d5fdfdb00173/pirojanamuxeluno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/961846da-a56f-4fec-accb-8382049a1eb7/como_descargar_fl_studio_12_gratis_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a2a64c3-0cf9-44b1-b9a0-c39cd669fb5f/norosogexijariwipiserim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5398/1589/files/43299908638.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7174/1338/files/camera_fv-5_lite_pro_apk_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b37b558-7600-45df-ae2a-ff5b7efe84f2/jufadujomopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab60fe18-2083-47e2-83f5-d7fa7e1216d8/glucomannan_weight_loss_success_stor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acae931c-3f01-4ecf-bc15-6d6e722b3e68/dagajigedipatebiduromasuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fe57397-b0fa-48b1-8dae-cffd8f984852/arifureta_light_novel_volume_8.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000611b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x611B 4812 bytes
SHA-256: ff012f53d5be8a6ef61f4cc112a5936aa24b6a41ca5be3ad6b82f7db857e0a64
font_01_sfnt_off0000712b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x712B 9900 bytes
SHA-256: 31b61a4e8eed43890a83f14dcce5ec0b3c98d8278b05c0cc7820c769e1043b0d
font_02_sfnt_off00009334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9334 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
font_03_sfnt_off0000a133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA133 5308 bytes
SHA-256: fd041f5973b2c1f626820119fe34fba8127022569364e7cb22084c7f4400b85e