Malicious PDF — malware analysis report

Static analysis result for SHA-256 824a8cc6e0ffae9a…

MALICIOUS

PDF

67.5 KB Created: 2020-10-12 04:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3df98b7a8f96771c7794b8be3e41112c SHA-1: 7a560b8041e49ee2d8588a851ddbd199572c7f7b SHA-256: 824a8cc6e0ffae9a0411f4f044071c9116afc2fbe20da45a31c4084f2325b5ea
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 of which point to redirector infrastructure. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ggtraff.ru/pify?keyword=newton+raphson+method+example'. The document body, though heavily obfuscated, also contains this URL, suggesting it is a primary lure. The PDF also hosts a large number of other PDF files, indicating a link farm designed to potentially distribute malware or phish for information.

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=newton+raphson+method+example In PDF document text
    • https://site-1045398.mozfiles.com/files/1045398/17076048512.pdfIn PDF document text
    • https://site-1039273.mozfiles.com/files/1039273/sabanuziw.pdfIn PDF document text
    • https://site-1041857.mozfiles.com/files/1041857/zenuwuru.pdfIn PDF document text
    • https://site-1037920.mozfiles.com/files/1037920/lolijijobunipuvorigema.pdfIn PDF document text
    • http://majulexej.michelbeauvaisart.com/uploads/1/3/0/8/130814297/xitoteso.pdfIn PDF document text
    • http://xafile.doublehappinessllc.com/uploads/1/3/1/4/131437318/voreg_pelemoradesimuf_xiwuten_venagudij.pdfIn PDF document text
    • https://site-1037902.mozfiles.com/files/1037902/18927485941.pdfIn PDF document text
    • https://site-1039215.mozfiles.com/files/1039215/powinalojego.pdfIn PDF document text
    • https://site-1036730.mozfiles.com/files/1036730/kaxurozosuxus.pdfIn PDF document text
    • https://site-1039289.mozfiles.com/files/1039289/17763004454.pdfIn PDF document text
    • https://site-1036996.mozfiles.com/files/1036996/piloxobemajadudezeruj.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/0ca65be2-357f-4df2-8465-0a59b107fd38/kasuzube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d57e93c-c5c4-44cc-aa97-be62097a5a46/waleduj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d40c48c-62be-4577-b334-1937d5694509/zesaked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b5936be-165d-4a87-b3fd-5a0262f89d48/46740518398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed294c23-1bfb-40f7-a418-2881bcc98e42/badotoribati.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_off0000bdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD0 5328 bytes
SHA-256: 20b4272c051d26d537e11c8b186bdba380dc140c22ab1ed37a0ef56b7e404e96
font_01_sfnt_off0000cfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD5 15296 bytes
SHA-256: d3365da272c6d3b516bfc5bee60fc64b2e49ed02977dac1933b701fea7ec4731

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