Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd61328c8ae8359…

MALICIOUS

PDF

40.7 KB Created: 2020-10-09 05:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7e88f6d853f96b05effab8124da211b5 SHA-1: daf2715426fb898121fbcd00e454da6c744b6641 SHA-256: 8fd61328c8ae83593a12a161d5bff622e0cb13b65ea443f077c835a7538ef2b0
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to potentially malicious redirectors or disposable hosting. The document body text, while appearing as a "Ryobi gas trimmer manual", is likely a lure to disguise the malicious intent of directing users to external sites. The ML classifier strongly indicated maliciousness, supporting the heuristic findings of a link farm and malicious redirector.

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://ggtraff.ru/pify?keyword=ryobi+gas+trimmer+manual In PDF document text
    • http://files.natjacobs.co.uk/uploads/1/3/1/4/131453188/2832068.pdfIn PDF document text
    • http://files.patrickcoll.com/uploads/1/3/2/3/132303151/sevepebotakofek.pdfIn PDF document text
    • http://files.rickysvanity.com/uploads/1/3/1/6/131637240/c5c5277964b.pdfIn PDF document text
    • http://files.travelusamerica.com/uploads/1/3/1/4/131437235/jeradurupuxu.pdfIn PDF document text
    • http://files.asianyoungmusiciansconnection.com/uploads/1/3/0/7/130740625/b6fa3056.pdfIn PDF document text
    • https://site-1036991.mozfiles.com/files/1036991/rafadowovojivusalibeda.pdfIn PDF document text
    • https://site-1040359.mozfiles.com/files/1040359/potidepopiludalibisuba.pdfIn PDF document text
    • https://site-1036867.mozfiles.com/files/1036867/xesejagoxatotel.pdfIn PDF document text
    • https://site-1042736.mozfiles.com/files/1042736/74241088373.pdfIn PDF document text
    • http://kevetuju.coconutcafebz.com/uploads/1/3/1/4/131406827/vutazepusajejos-robogotonisuz.pdfIn PDF document text
    • http://files.ocfnh.org/uploads/1/3/1/4/131453980/jetebefiv-dodubuk.pdfIn PDF document text
    • http://ziratuzen.wolvescomputerrepair.com/uploads/1/3/0/7/130776854/japidutiruradugedif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000061a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A6 5256 bytes
SHA-256: 4aea238a0e1b35eb42b4487b41e105f8dd8dbe082089a2bf33a5b7b908fdaa10
font_01_sfnt_off00007383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7383 10260 bytes
SHA-256: 3018b1680324f6f234c46d50b526658b5db2ab7405df6511c0fe1719dcf230fb

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