Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4687e38d121ec7…

MALICIOUS

PDF

41.5 KB Created: 2020-10-03 11:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ebd4781d39839b334b20b0a6c27b6157 SHA-1: 9dd7d3faec2684fc698a6a824437b1793d866c5f SHA-256: af4687e38d121ec728d2c3bcbe3dd28bc9bb4c5e51719f4ddfbb143411301cf3
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to various websites, many of which are hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The document body itself contains a URL that points to this malicious redirector, suggesting an attempt to direct users to harmful content.

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/strik?keyword=calaveras+para+colorear+dia+de+muertos+pdf In PDF document text
    • http://mekonotaw.house-removals-surrey.info/uploads/1/3/0/8/130814416/7751483.pdfIn PDF document text
    • http://valiv.patriciamacdonaldart.com/uploads/1/3/2/3/132303195/pisulafemexun.pdfIn PDF document text
    • http://tiwagos.imasters-international.com/uploads/1/3/0/8/130873982/jikem.pdfIn PDF document text
    • http://zizatuko.woody-acre.com/uploads/1/3/1/3/131383837/nasavukenaf.pdfIn PDF document text
    • http://femex.isabelsherk.com/uploads/1/3/0/9/130969368/3580859.pdfIn PDF document text
    • https://site-1037240.mozfiles.com/files/1037240/98054470195.pdfIn PDF document text
    • https://site-1037152.mozfiles.com/files/1037152/69812068706.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/29ddc1c8-acdc-40eb-9de4-a11925c01e59/61559397193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee2a70ff-862b-441c-9ac7-9f8da12dc80a/xebenedajibupanosef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7aeec97-4c33-4aee-b2a2-dd3f06a2909e/90322204257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fafaff60-3ec8-44e4-9185-cf1028fe118e/rokogarexude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ade8d0f-5bcd-4956-95e8-256220ad4238/nulutaleve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c663e3b9-bd9e-465e-bc22-a6967e1e8e31/82757500987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b059861-56f6-429c-a449-21d64b10f12a/45578629940.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_off0000609d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x609D 5264 bytes
SHA-256: 538fcb155f6a0d2d0f46da5a71e6832767d67a43e64b2e18a8381b02d24544f6
font_01_sfnt_off00007275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7275 11316 bytes
SHA-256: e90184ba35001291e8fb3c8101119c80daef40a869228fcaa0f60a09a4e4ffcb

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