Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f2f8ab81f02a16…

MALICIOUS

PDF

51.8 KB Created: 2020-11-04 22:08:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d28f13fbfc92fda2ec356c53d9770c9f SHA-1: 59b24f509f1e88af78df2f7298837df285a43690 SHA-256: c9f2f8ab81f02a1601b9a456756b8c135db839437ee17a4f48b5f1268a9e591a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to redirectors and link farms hosted on disposable domains. The document body text, though heavily obfuscated, contains a URL that is also present in the embedded links, suggesting a coordinated effort to direct users to malicious content. The ML classifier also strongly indicated maliciousness.

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://ttraff.com/123?keyword=judgement+friend+guide In PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/ebb6fa87afd6f50.pdfIn PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/5330896.pdfIn PDF document text
    • https://terogoke.weebly.com/uploads/1/3/4/5/134587715/d677f9c24ff43fa.pdfIn PDF document text
    • https://vitaworitevazol.weebly.com/uploads/1/3/4/4/134484496/4152715.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/kovojoxokisima.pdfIn PDF document text
    • https://romovemesokawaj.weebly.com/uploads/1/3/4/4/134479736/boxesijasoge-turimigosenifor-mozikejekud.pdfIn PDF document text
    • https://tugoxalimirufa.weebly.com/uploads/1/3/4/3/134310877/sipalemugud.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/9276785.pdfIn PDF document text
    • https://xuvarilanagore.weebly.com/uploads/1/3/4/4/134470983/8691700.pdfIn PDF document text
    • https://wawurekufa.weebly.com/uploads/1/3/4/3/134322490/8304836.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/de430d9f-c081-446b-aeaf-a7c751d1fa61/linifudub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0696fcd0-d300-4660-95c2-ab90ca54b58f/15670818700.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/xiduteputelejezaweg.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/36806409480.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/tarzan_movie_full.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_off00008d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D2E 4796 bytes
SHA-256: f3401588dc2b62308b2dcb8f6bc2b1d3212934436f01b73d2f2167b87c81a8d8
font_01_sfnt_off00009d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D6E 12096 bytes
SHA-256: b14a5e5b66cc488d44af12c255a8b7caf2de93697164b76b0b82e77de8c01463

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