Malicious PDF — malware analysis report

Static analysis result for SHA-256 05be3d10bf8c792a…

MALICIOUS

PDF

38.9 KB Created: 2020-10-04 04:39:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2ff155f62226db252caf819285b852cf SHA-1: 894ec11512c82a265a07e0d11ab6d986e6895d87 SHA-256: 05be3d10bf8c792a6b73c2b73d5914f2894bc44e1087e688adf4097eb83b35d2
164 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for software downloads, specifically mentioning 'scribblenauts unlimited apk android 1'. The presence of numerous links on disposable hosting further supports a malicious intent to redirect users to potentially harmful content.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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://ggtraff.ru/pify?keyword=scribblenauts+unlimited+apk+android+1 In PDF document text
    • http://files.theyogaschoolny.com/uploads/1/3/0/7/130775942/668541.pdfIn PDF document text
    • http://files.tourscottys.com/uploads/1/3/2/7/132740267/4316473.pdfIn PDF document text
    • http://fowodo.letsleepingpigslie.com/uploads/1/3/1/8/131856222/e18d55bbb445009.pdfIn PDF document text
    • http://gelegogo.camdensupply.com/uploads/1/3/2/6/132695478/2524b72ea05.pdfIn PDF document text
    • http://rumun.privatecounsellingandmediation.com/uploads/1/3/0/7/130775565/6f575.pdfIn PDF document text
    • http://larisi.nationaltire.ca/uploads/1/3/1/4/131408738/2485953.pdfIn PDF document text
    • http://files.gymfreaks.net/uploads/1/3/1/3/131380901/zupifama.pdfIn PDF document text
    • http://didoloko.uncholimoli.com/uploads/1/3/2/7/132710712/456113.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/4662380e-5dc2-47e4-a333-e54a19648639/4950035405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33c59c98-b8cf-4a30-a801-49f93e663a37/gitalojitamapejegilad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0337fcc2-37a9-4c61-9d73-24f768d83d71/pivideguwadexanalawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce3b6c9a-1023-4b99-959e-1a7d1d7ac31b/siperosodopinewosun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2476eb16-3245-46fa-ac25-a24f7488fab4/81102050319.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_off00005905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5905 5576 bytes
SHA-256: 9eecac8d9590e2fad2973e32af5d7dff9593c1cdb4ba26a03b08e03f981cbf05
font_01_sfnt_off00006bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BDF 10320 bytes
SHA-256: 0b309c572013f4652926b03a5868a136989f25e85e17b3b58d956f9ffcbbb9da

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