Malicious PDF — malware analysis report

Static analysis result for SHA-256 7034282254a272e1…

MALICIOUS

PDF

65.6 KB Created: 2020-12-07 14:22:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1979c98063ee1d89a39b32e99f5bafc SHA-1: 1c0d31dba43cc080187d292935de8ca5d1d2e247 SHA-256: 7034282254a272e1271df27eebe64c40f571f7b874d39fdc789a2cb6a8ebf686
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, indicative of a link farm. One of the URLs, https://cctraff.ru/strik, is identified as a malicious redirector. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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?utm_term=mass+effect+morinth+banshee
    • https://dumitekajeru.weebly.com/uploads/1/3/0/7/130740207/2056368.pdf
    • https://xejibojap.weebly.com/uploads/1/3/4/3/134310503/foxasusetoda.pdf
    • https://jetabasujupeg.weebly.com/uploads/1/3/4/7/134703241/e34da98e8638c.pdf
    • https://jedufopev.weebly.com/uploads/1/3/4/4/134490540/buramagemedaraj.pdf
    • https://static.s123-cdn-static.com/uploads/4413231/normal_5fc8d63646fc6.pdf
    • https://static.s123-cdn-static.com/uploads/4412763/normal_5fc4bcaaed4eb.pdf
    • https://cdn-cms.f-static.net/uploads/4454424/normal_5fbda70edadae.pdf
    • https://xufetujada.weebly.com/uploads/1/3/4/7/134745175/2809180.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc167576609fd0ee794de9f/t/5fc7065da038a451bce34a7d/1606878813417/server_de_tnt_run_1._16._1.pdf
    • https://uploads.strikinglycdn.com/files/f2f3efe3-025c-4a07-80a9-aef5ecb2c9e3/bontrager_ion_700_R_USB_svtlomet.pdf
    • https://static1.squarespace.com/static/5fc00a03c6229360eca839ab/t/5fc1fce8f81c9a2a0ce82d40/1606548717088/arpita_chatterjee_economics.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5b0.bin
d0f3733f797ff59d91abb2cecb72cee0f89f7da12d692b75ebd1478cd4515d16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B0 5236 bytes
font_01_sfnt_off0000d762.bin
2975ea50b1e0289247b052b44988b97c0747d37666b9f22430c60f7ca2b0c2b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD762 10292 bytes

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