Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9addf9229eb7f2…

MALICIOUS

PDF

43.8 KB Created: 2020-10-12 10:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 75ec374180152f2417abddbd8082eba6 SHA-1: 62ef412cbb98a4a6a1d6221897f09c60b5bed658 SHA-256: 5b9addf9229eb7f205efc92a5aae0bd1662e3a889e523c414a3c787887453de2
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and one specifically to a known malicious redirector. The document body, though partially corrupted, contains text suggesting a lure for free downloads, which aligns with the malicious redirector URL. 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://cctraff.ru/strik?keyword=tamil+comics+book+pdf+free+download In PDF document text
    • http://files.dmitriykalantarov.com/uploads/1/3/2/6/132680976/vosesozinijiba.pdfIn PDF document text
    • http://files.tuggerahlakesphysi.com/uploads/1/3/1/4/131453121/d3f76e28f1c8.pdfIn PDF document text
    • http://files.eguastella.com/uploads/1/3/2/6/132682282/4291642.pdfIn PDF document text
    • http://files.michellewiebe.com/uploads/1/3/1/3/131398036/wawojufogawaje_famisowu.pdfIn PDF document text
    • https://site-1036656.mozfiles.com/files/1036656/72305465577.pdfIn PDF document text
    • https://site-1036988.mozfiles.com/files/1036988/30934058848.pdfIn PDF document text
    • https://site-1040568.mozfiles.com/files/1040568/51316334734.pdfIn PDF document text
    • https://site-1042629.mozfiles.com/files/1042629/xilivejaxop.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/abc0c903-a00b-4222-9c68-9d86e72d788c/fidiporofamuripedoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7ddb6ca-4500-47db-9f58-085970922a5a/gorofegirolum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db4fee2a-9e34-4a36-8279-d55527bdd8b9/sumiroxixojozotoximugeko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a4c3d4-b2cd-476a-b08b-c937256a6780/7819274915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d74efea3-31f2-4a54-99bf-28685e3aaa4a/piwogigap.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_off00006c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C01 5548 bytes
SHA-256: 2d89d8978201b1d4b9284d2783e4075c71ac361ec701ffd8719e1bec8291cfb5
font_01_sfnt_off00007ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED2 10388 bytes
SHA-256: 60d9079816bc139275cfe59c35922645993dd007e5a80b949169fbbd8b698f6e

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