Malicious PDF — malware analysis report

Static analysis result for SHA-256 32fc62490187ef4d…

MALICIOUS

PDF

46.7 KB Created: 2020-10-03 11:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 97f571ae4ddd050b3be7e2c5eb72efcf SHA-1: 66da354463117364424f97958ef0f48b492a81f0 SHA-256: 32fc62490187ef4d9875b90e1e75d6709646a6e035a2210b4e709df711caa0ca
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to an answer key, which is then linked to a redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of malicious redirector links is a strong indicator of a phishing or malware distribution attempt.

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.cc/pify?keyword=digestion+worksheet+answer+key In PDF document text
    • https://site-1040144.mozfiles.com/files/1040144/36273417510.pdfIn PDF document text
    • https://site-1040180.mozfiles.com/files/1040180/kuxoxonolijasug.pdfIn PDF document text
    • https://site-1036621.mozfiles.com/files/1036621/fikezakevabot.pdfIn PDF document text
    • https://site-1042968.mozfiles.com/files/1042968/bewaga.pdfIn PDF document text
    • https://site-1038575.mozfiles.com/files/1038575/73841848252.pdfIn PDF document text
    • http://jisenofus.caddaypie.com/uploads/1/3/0/7/130776445/fakifufilekisidez.pdfIn PDF document text
    • http://zifur.rockhillgallery.com/uploads/1/3/1/3/131379312/zepaleloj_zizipisupisaf_saporuj_gugafufe.pdfIn PDF document text
    • http://nejusuxu.johndpascoe.com/uploads/1/3/2/6/132680955/0b3708f1943b.pdfIn PDF document text
    • http://files.georgiandiningacademy.com/uploads/1/3/1/4/131455141/riremitepovano.pdfIn PDF document text
    • http://talefinij.sandiegobestpartyrentals.com/uploads/1/3/2/6/132695601/3c6d64b0752b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9820/5077/files/xebipasodotikodes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2907/5880/files/80661175553.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3227/5865/files/karma_sutra_diagrams_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9127ca96-a80c-4858-9fc8-40cc9a447f82/fizivedowoxobiwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76326f06-043e-4510-9f90-8c5560b47471/3301030966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba157b8b-8c8b-4517-84f6-2630b872995a/vikomozevukuputaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6e7d8b5-ddab-413b-93ec-c0d0088d403e/guninebesuvij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb175a98-9194-46ab-b11f-4ab3029d8b40/wamip.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_off00007955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7955 5172 bytes
SHA-256: 0dbad9c37b0a94d9b99c426b3a93f1dfb85d461b6c3904736bc9d9d8aa7a028d
font_01_sfnt_off00008b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0E 10120 bytes
SHA-256: f3125386ce6e65d21e334c1887cca95f0794afac52a8d9458c5d9a3a9eb1a77c

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