Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff84f3107ffc6f43…

MALICIOUS

PDF

51.9 KB Created: 2020-10-18 08:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 163f5c5b793a68dcb9954c385734a05b SHA-1: 00dc76c92521f874d2fd2cc3f427cd3c28501921 SHA-256: ff84f3107ffc6f434e9717d8ff4ac849bd10c37f6fc6e62d73b0ec896d5a59df
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though obfuscated, contains a URL that matches one of the identified malicious links, suggesting the document's primary purpose is to drive traffic to these sites.

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://cctraff.ru/123?keyword=example+of+onclick+event+in+android In PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/3794757.pdfIn PDF document text
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/mudini.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/jogima_ravidugeka_jodub.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/nojof.pdfIn PDF document text
    • https://mogezisatizate.weebly.com/uploads/1/3/0/7/130775403/9209594.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/91e26.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/36ce75ac.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/ef82e0d.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/c48f341c-d1f7-4e28-9e52-04e43fbd9272/4663099395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e52e815-3bc0-46d7-95d0-07ef54475ae6/xovaxelijuriguxavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a40996f6-8906-4435-a8d8-0d6125689317/17952885388.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/1633/9623/files/bexupugawivajunitozu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5834/8703/files/the_office_todd_packer_actor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4674/3449/files/49553869767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7451c74a-710c-4d80-8596-95b80211715a/13291620297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca0737ab-1eac-44d7-9bd4-0578c910b480/marobudisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f64a5bf0-0fd9-4028-a51f-892bb7624745/dixulafavosidoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27d0b46d-fe97-4c64-9dd0-fc8b264642e0/67401286384.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/8902550779.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4086/9014/files/6064089888.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/3248/1429/files/lotus_notes_calendar_reminder_popup_not_working.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0193/2706/files/32556726699.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3418/0769/files/17603986179.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_off0000878e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x878E 5272 bytes
SHA-256: 272ea7e241df103a11974fb3f869633e40cf487f4e1881fe1cdf51c25ef16851
font_01_sfnt_off00009978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9978 12656 bytes
SHA-256: 1e0a0bcfb9e97bcc2d8161570d64561c74beef1a9443808280e863774ae56a7e