Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49a59f706492a63…

MALICIOUS

PDF

63.6 KB Created: 2020-09-30 17:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ae6ef1447faf0f1fd87f8e1ae55892eb SHA-1: a3c3c098582b9e5124f8b8cc3e961226074cefce SHA-256: e49a59f706492a631c7ed57b9b20d7443c909c3a68de7eb63981e937b4dc3bf2
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though partially corrupted, contains text related to downloading PDF books and a URL that matches the malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple links to disposable hosting further supports a malicious intent, likely for phishing or malware delivery.

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=best+sites+to+download+pdf+books+quora In PDF document text
    • https://site-1036719.mozfiles.com/files/1036719/61630506563.pdfIn PDF document text
    • https://site-1036783.mozfiles.com/files/1036783/36665150087.pdfIn PDF document text
    • https://site-1036884.mozfiles.com/files/1036884/gabudunuketagi.pdfIn PDF document text
    • https://site-1037843.mozfiles.com/files/1037843/xazewizokub.pdfIn PDF document text
    • http://files.mswoodard.com/uploads/1/3/2/7/132741189/4636906.pdfIn PDF document text
    • http://files.realhealingstudio.com/uploads/1/3/0/8/130873758/dajilareloxeke.pdfIn PDF document text
    • http://files.mrscothran.com/uploads/1/3/1/1/131163550/13a5dee1068e.pdfIn PDF document text
    • http://pipin.kellytruax.com/uploads/1/3/0/7/130776180/vesamig-wowuwesak.pdfIn PDF document text
    • https://site-1036932.mozfiles.com/files/1036932/75689679305.pdfIn PDF document text
    • https://site-1036637.mozfiles.com/files/1036637/66712088831.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/d4f8fd33-6110-44bb-807f-a9d421f21bb0/momufixokemimipumiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f904d0e-d3c4-4111-83da-11e686ece6bf/36044667640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2991ad0c-2af8-44ed-b946-3d9830360812/suluwidewuxiwuvanejif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/265b7a9a-e080-48ee-b2fb-207f9ad741be/95759452526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae71633a-2708-4136-9e63-5febfd2909b8/bejepe.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_off0000b87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87F 5504 bytes
SHA-256: 93cd06a0665309c97e6b5e33faaff14171db8aa50ce912eb2720edc0a6c01f86
font_01_sfnt_off0000cb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5B 11156 bytes
SHA-256: cad2399fa53131b13640b094cd5851935058ebdbbb26be1fe773691ee9795f95

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