Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f90ff4c35b40dd6…

MALICIOUS

PDF

51.3 KB Created: 2020-10-05 01:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4c108aa223c963fd43f1cb1739c44056 SHA-1: 7e7c10d6b652087645f4536af8734a584d1d11cb SHA-256: 5f90ff4c35b40dd6b69faf67ad293a4ed2b006a37954141c8b3451e376074d34
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying one as a known malicious redirector. The document body, though heavily obfuscated, contains references to URLs and appears to be a lure for SEO-based PDF link farms. The primary malicious link identified is https://ggtraff.ru/strik?keyword=synonyms+and+antonyms+in+english+pdf, which is likely intended to lead the user to further malicious content.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=synonyms+and+antonyms+in+english+pdf In PDF document text
    • http://files.sarasotacountysurplusproperties.com/uploads/1/3/1/3/131381991/5313266.pdfIn PDF document text
    • http://files.blues-city-kids.com/uploads/1/3/1/3/131382841/ranoko-tapukaguluviraj-goliguvagoxajat-metepusakipu.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/1/0482/3836/2786/files/49493013963.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3485/2514/files/riverbank_state_park_indoor_pool.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1898/5377/files/topijoroga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4392/8726/files/the_8_parts_of_speech_diagnostic_assessment.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/2947/5740/files/mohave_county_inmate_search.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d85307af-a1ec-406d-9a72-56758fb307cd/getav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddc19799-1f3a-4c9a-851c-2c27c019dcf4/9849524351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a63084c5-66a2-4f9e-9d0e-1d3f9e5b3718/deligeruxagakiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/927bae39-53da-4214-8e21-424b1e7a9df9/todedoripusejudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b2b82ec-7dc5-44ff-a080-690c3bfb4f88/botawowufelonerudisej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6bf863d-8c90-45ca-a224-99db6fc61a60/20076793847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bfcea64-852a-4241-9e3d-c90b18ec7aa7/54996548621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07757ca5-a213-489c-9921-8a8a1329ad89/16506971791.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a4503c9-27e7-4e26-947e-80d6c9dc1202/pekave.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D86 5352 bytes
SHA-256: 9832684834b8149b3d022b4c0f91c96fe672eb521d14a27f9ded18e5af647040
font_01_sfnt_off00008f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F8F 10180 bytes
SHA-256: 9b4d2916251a161eba49ada953ccd31230b1fae3f57fb9bb6a120740ef74df14
font_02_sfnt_off0000b221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB221 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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