Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e44842b4ba5c56…

MALICIOUS

PDF

60.6 KB Created: 2020-10-11 00:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 042c0b1155f992e538ef9b2fcf48620b SHA-1: f4d1e561d61010d6b2d526b110dd98da40d03390 SHA-256: 61e44842b4ba5c565869313ff07d3f8198dd18b839dbfe770ae65a681278e35f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of a link farm on disposable hosting further supports this. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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.club/pify?keyword=nanda+nursing+diagnosis+pdf+2015 In PDF document text
    • https://site-1037858.mozfiles.com/files/1037858/52496938837.pdfIn PDF document text
    • https://site-1042788.mozfiles.com/files/1042788/14799604398.pdfIn PDF document text
    • https://site-1040329.mozfiles.com/files/1040329/43807454902.pdfIn PDF document text
    • https://site-1038532.mozfiles.com/files/1038532/88726243222.pdfIn PDF document text
    • https://site-1036815.mozfiles.com/files/1036815/tebuvabagavixa.pdfIn PDF document text
    • https://site-1037033.mozfiles.com/files/1037033/navukuboduzuxizinaf.pdfIn PDF document text
    • https://site-1039618.mozfiles.com/files/1039618/libanaxinosugujeb.pdfIn PDF document text
    • https://site-1037103.mozfiles.com/files/1037103/putuzobetuk.pdfIn PDF document text
    • https://site-1036679.mozfiles.com/files/1036679/49863666235.pdfIn PDF document text
    • https://site-1036805.mozfiles.com/files/1036805/nobakutili.pdfIn PDF document text
    • https://site-1043494.mozfiles.com/files/1043494/daxiwewosupunepazotifibol.pdfIn PDF document text
    • https://site-1039506.mozfiles.com/files/1039506/dijotedinadodanovagaro.pdfIn PDF document text
    • https://site-1038825.mozfiles.com/files/1038825/xafoboweni.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_off0000af7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7E 5596 bytes
SHA-256: 3a74eb33d664996dfb8874a36be54d7af11333e2fe90ef618a0939464aff9e7c
font_01_sfnt_off0000c2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A1 10112 bytes
SHA-256: 0a4feb7740f670e174f4dacac5bb8e4d5d169ea219b05d2cf6ff65c5bce09b94

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