Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53bc4e78f88f7df…

MALICIOUS

PDF

47.0 KB Created: 2020-10-10 09:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4b09a5e9127320ab28f81ee502fe4d77 SHA-1: f9c7fa4897421d479989683916aeb7c0d78dd6e9 SHA-256: b53bc4e78f88f7df97fd303f2e078eedccd0ee19c0f80cb67a0c0503460e6927
184 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'Dream car unblocked' and embeds a large number of links to external PDF files, indicating a link farm or redirection strategy. One of the embedded URLs, 'https://gettraff.ru/strik?keyword=dream+car+unblocked', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely as part of a phishing or scam 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://gettraff.ru/strik?keyword=dream+car+unblocked In PDF document text
    • http://bilofuga.thekingdomofsaguenay.com/uploads/1/3/1/4/131452836/xiwimaki_dijonepofur.pdfIn PDF document text
    • http://files.firstumcgalesburg.org/uploads/1/3/2/8/132815175/kilefite.pdfIn PDF document text
    • http://vubejekaj.themettacentre.com/uploads/1/3/1/4/131438356/8127902.pdfIn PDF document text
    • http://gipagal.lethbridgeelectrical.com/uploads/1/3/0/7/130776783/079b902.pdfIn PDF document text
    • http://files.valleyrootsfoodhub.com/uploads/1/3/0/7/130775868/renimeni.pdfIn PDF document text
    • http://mazojokuf.bcpreventionnetwork.com/uploads/1/3/1/3/131398589/sobowejonelimusotat.pdfIn PDF document text
    • http://nufuxeru.gardenbaptistchurch.net/uploads/1/3/0/7/130738684/mufiju-lokuroke.pdfIn PDF document text
    • http://xubupis.rebec2000.com/uploads/1/3/0/7/130739291/8465e66576348b.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/6a39f7c0-0833-4534-9cc4-1363c08eed28/ramopopepuvekifuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/964e94ab-637b-458b-8e43-85d5192e4c77/54133633466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37ce6d18-a3fc-44f6-950e-569539c6de1b/likon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a226057-6dcc-46b7-9c61-a343fab42337/fomebawitenoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11bf9bde-8ac1-4bf0-9180-9ce3d9e4cb87/73019411253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e96f64db-d0bd-44d8-b098-a9f030d3d452/sibeniku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b90d552-a89f-43d0-a583-5669c11507b2/58339403147.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65F8 5112 bytes
SHA-256: ac6445529e4069bbb55853747fb6ae3ba5a75a2fbef92b5148714ff190cb2cd2
font_01_sfnt_off00007744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7744 10324 bytes
SHA-256: 40c0065eaade91f73f139a7c2f29a2bd24e1e9d18e69ce0cba21f44d5ac20c7e
font_02_sfnt_off00009a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A9C 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb