Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec01ce0d7c41a59…

MALICIOUS

PDF

69.6 KB Created: 2020-10-18 07:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 1b1957c4b952a9eab2fcabdfd9eb6719 SHA-1: 2c4f98a6bb01e4540b84435623ac77aaec9847a3 SHA-256: 8ec01ce0d7c41a590dc9907ce29568d5d6516514ff2c48457d863cfdc26589f4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to link farms hosted on disposable domains. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

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=dialogue+avec+l+ange+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370087/normal_5f891b295df00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376354/normal_5f8b90f1d9b90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f87028f4a7b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371809/normal_5f891664e6886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368243/normal_5f8764d358826.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/8070014.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/kadijamiruvinugeno.pdfIn PDF document text
    • https://ziperivowupidu.weebly.com/uploads/1/3/1/3/131381589/ravuvusenojo.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/80e56d498663.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/8279107.pdfIn PDF document text
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/fawobugeked_javuvuga_jiriwoje.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/kidiben.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5f89637924833.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369796/normal_5f8b71c9939fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370543/normal_5f8ba5f49d9b2.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://cdn.shopify.com/s/files/1/0498/0647/5426/files/normal_quantile_plot_python.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2557/8156/files/sram_guide_rsc_disc_brake_pads.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3393/5519/files/pinajorugoda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5314/6527/files/instrucciones_termostato_coati_12652.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7777/7061/files/97110684721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/526b5358-d42f-4802-a5ef-f38b9d285698/xenomitizasamifer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05143ca5-cd1b-4423-8cfa-405fd9284952/baros.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_off0000b118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB118 3516 bytes
SHA-256: 1233ba5ffaddd616f58d650f3398bffdcb948588bb82fc8c784ee67a0a465a30
font_01_sfnt_off0000bdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB2 4912 bytes
SHA-256: 632eb98602f0ffde2cdf83ddc06acb79bf3dad40cc996198593ce096748fd65a
font_02_sfnt_off0000ce80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE80 14640 bytes
SHA-256: e26616108cfe7abf25ec3a78f2bd9f6378a67bc7058d76c358beb23b843511b9
font_03_sfnt_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3