Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fe7001d3bed085…

MALICIOUS

PDF

36.0 KB Created: 2020-10-26 17:41:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2d132d20de8ebf47458e45cf9cf8aece SHA-1: da7bfa576d3c735fbafb7611b605b5dcacedd9c4 SHA-256: a8fe7001d3bed085f98ef3db52f5ba1c2ec318d857b4a94983ad33994363e180
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting an attempt to lead users to harmful content. The ML classifier also strongly indicated maliciousness.

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/aws?keyword=algebra+1+volume+1+teacher%2527+s+edition+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416934/normal_5f9536362544e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_5f89f0e532886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405419/normal_5f9559a0bf4a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375887/normal_5f8f6db84b39f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vavabi/law_enforcement_phonetic_alphabet.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/witefumojik.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/vorawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b80cd8a-7768-41e9-bb28-d3529340b12b/185986991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9cf68bd-f096-4f8f-b7ae-c6e5193faa4b/wozisabudenudifukup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/090cff04-1574-42da-b859-dc627cbb759b/jutikobez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e5c8526-4230-4645-9772-d025622b7192/linawajenakojujolal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0ba9626-2891-46c8-ae85-30e526bf93f6/gowavowibibogizobaboleg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb40413-4978-43af-bded-16facbce5c77/53861887748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6d674f2-60ac-46ec-9264-c7ee45c24314/98169424845.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/sezazudoz.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/semog.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/debexo.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/1172675384.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5391/4530/files/441171468.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0020/7777/files/lok_sabha_election_date_2020_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5027/0371/files/csu_channel_islands_campus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8283/2790/files/bojakav.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_off00004bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BC5 5844 bytes
SHA-256: f2774cce4003c426c609aa5b7c6e902915a1821d59dd3cec44a70a23ff04a78b
font_01_sfnt_off00005f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F97 10120 bytes
SHA-256: 5c78a36af8224dc83973717fe31bbfece5a8bd686d62fecc8eced5f5ac70286f

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