Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b78123602a1c2af…

MALICIOUS

PDF

38.1 KB Created: 2020-10-08 03:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b49b5ea94f3553ce1b9c94e2d065066a SHA-1: e4ded7c1a02a9dd98a80d0c847e70819773a6fdd SHA-256: 5b78123602a1c2af72ab4a71ab31370aaedd7231281c8d01550082dd7b60c227
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, and one specific URL is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a "Gloomhaven organizer pdf" and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=gloomhaven+organizer+pdf In PDF document text
    • http://gezezaza.denaliarts-glassstudio.com/uploads/1/3/0/7/130739430/zipeza-kisuzo-tokedewaxa-lizokagumovomok.pdfIn PDF document text
    • http://files.pawtuxetvillageassociation.org/uploads/1/3/1/4/131406036/2519180.pdfIn PDF document text
    • http://junixekeg.stjeromelibrary.org/uploads/1/3/1/1/131164250/morewizixo.pdfIn PDF document text
    • http://files.ocwino.com/uploads/1/3/1/6/131637043/5e75729b2.pdfIn PDF document text
    • http://bedojede.lifephotofl.com/uploads/1/3/0/7/130775173/7033038.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5180/9959/files/81674382570.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9500/1750/files/46129978629.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7820/4574/files/how_to_set_permanent_print_area_in_google_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dde9028b-a11c-46fb-909c-b398351c61c5/84427088472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13e9be65-1219-4281-bf9a-836ef6cccd20/gowosoreminutiwikat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6738b4b2-b400-44c7-81ea-212f5bdc8418/65016892172.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5915/8938/files/crittenden_county_jail_roster_west_memphis_ar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6591/2729/files/9200490956.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000563c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x563C 5416 bytes
SHA-256: 286266d6d901f22e8ac8fbee6ee75f3aa73a252113489e2a2b815de2932abeb5
font_01_sfnt_off0000688e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x688E 10464 bytes
SHA-256: e33202055e8ae39aefcf3c68769bda8dacaaa168c4d4992f92b00185f5ac906a

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