Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40d6995b33423d1…

MALICIOUS

PDF

46.9 KB Created: 2020-10-12 09:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 27e6ff1edd4a78453086d7379dd998e1 SHA-1: 1406363d1cf6a5500eb3718096483f823e85fb28 SHA-256: a40d6995b33423d1a9dd50bd400fce11d34d43993c85927be0d50b840b165c44
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, contains a URL that matches the malicious redirector, suggesting a phishing or link-farming attempt. 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://cctraff.ru/strik?keyword=exercicios+de+fonologia+com+gabarito In PDF document text
    • http://files.crawdaddyforge.net/uploads/1/3/1/6/131606362/7ce5ea0f237edc0.pdfIn PDF document text
    • http://files.authortomanthony.com/uploads/1/3/1/4/131452958/rerutenup.pdfIn PDF document text
    • https://site-1038590.mozfiles.com/files/1038590/11310863126.pdfIn PDF document text
    • https://site-1040998.mozfiles.com/files/1040998/70232681139.pdfIn PDF document text
    • https://site-1039636.mozfiles.com/files/1039636/22848346889.pdfIn PDF document text
    • https://site-1040327.mozfiles.com/files/1040327/82573457543.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://uploads.strikinglycdn.com/files/3e288652-2363-44d5-b9b2-82de98a7e6ea/pofomapofovusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea1bcc2d-371b-40c9-a353-796585b81e2f/gudezeviwemeduteteviwak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d34d43e0-20cf-4af8-a94f-5db3ef203c6f/15128465116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d39fdfab-7b42-4add-913d-a9c84b327572/wegivizibomutawetepofore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbe39edb-cdaa-47af-ab20-48c49d6e698e/lekogidajetikilase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/412015be-9b57-430b-9a84-49e91ab2e980/gexajegozuni.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6246 5292 bytes
SHA-256: 2be861d0178f9a77ab2640f58a4810b9b6d0418d644ccb368a07dd20b9aa368b
font_01_sfnt_off00007423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7423 1852 bytes
SHA-256: a2af1f685b55b0c685b8540f6ea4ed5b5fb980cec2d95065e4f58d89d6d1c452
font_02_sfnt_off00007cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CFA 10372 bytes
SHA-256: 96d54eb60fb8f50dc361c197a4534ad472037c1e4fb5f2b4e53d801f5ed05918
font_03_sfnt_off0000a07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA07A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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