Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ced73b8e6d9cdd…

MALICIOUS

PDF

48.6 KB Created: 2020-10-10 11:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dd0d491732b5691d4d313c982945fccf SHA-1: dfe9fa56c3566af90bc379baca023652852ad420 SHA-256: 10ced73b8e6d9cdda3f5bc1b39053755485d300b2ee9011e952f0e66cbb6077b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable domains and redirect to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. This suggests a link farm or phishing lure designed to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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://ttraff.club/pify?keyword=kenton.kyschools.us+ap+gov In PDF document text
    • http://pexelas.jenmillersclass.org/uploads/1/3/0/8/130814011/22bf562a.pdfIn PDF document text
    • http://files.jessicaelkayam.com/uploads/1/3/1/3/131382673/fc26c220d7.pdfIn PDF document text
    • http://babidiwo.lifebloomsbirthservices.com/uploads/1/3/0/7/130739646/lukerivoloparedefiso.pdfIn PDF document text
    • http://sipes.m3acres.com/uploads/1/3/1/6/131606289/650a249386.pdfIn PDF document text
    • http://files.meredithzahn.com/uploads/1/3/1/4/131406286/b46cc1.pdfIn PDF document text
    • http://sivap.leescrossroadmbc.com/uploads/1/3/0/7/130775545/vozogetamoj.pdfIn PDF document text
    • http://files.tell-talepublishing.com/uploads/1/3/0/8/130873875/sazenazitebek_nisumakeraw_suwudenes_fazujupufijum.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/1/0496/1422/5559/files/cube_world_wiki_pet_food.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ccc4a32-084e-4f22-b0ae-c4401a2c74f2/tofudowolaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67af6e91-7a91-4ce5-bfb6-c816732cd7a3/gazokus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd1a8a87-c49b-4a72-92a8-40aa5c752bf4/memewuwipukotatufol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62bdb093-a08a-411b-b22d-7e39689eb86b/marupuvofejiboratomidonej.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_off00007ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF7 5324 bytes
SHA-256: 8a371ac52040f7f98367ded0c0ebe7906401862f3e5303a7a92ad008f716e1b9
font_01_sfnt_off00009136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9136 10808 bytes
SHA-256: 211ee4f43d5a5c0aa0528fd0a34a8158e9981e0ce7965b40d17cdd3416b16c82

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