Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2baf081342f14ab…

MALICIOUS

PDF

49.0 KB Created: 2020-10-02 04:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8ef137c38e877659f653d73d0b16ce46 SHA-1: 2b9f13f617cbb2d90b9f88054711c9fe9c43b6bf SHA-256: f2baf081342f14ab8f5f7946f8ce5247e06944afb3c2054baa40765e4595b7aa
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to known malicious redirector infrastructure, disguised as an assessment answer key. The document body itself is heavily obfuscated but contains references to the malicious URLs. The ML classifier strongly indicated maliciousness, and the link farm heuristic suggests a deliberate effort to host malicious content on disposable domains.

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.club/pify?keyword=mid+module+assessment+task+5.6+answer+key In PDF document text
    • http://files.morningsidechildrenscentre.com/uploads/1/3/1/6/131607522/5034740.pdfIn PDF document text
    • http://files.plaisanceenglishsetters.com/uploads/1/3/1/6/131607063/vutaxidunev.pdfIn PDF document text
    • http://jagez.wakefieldvalleynursery.com/uploads/1/3/0/8/130814030/rariwudi.pdfIn PDF document text
    • http://files.christianinsiderprep.com/uploads/1/3/1/4/131437516/5231339.pdfIn PDF document text
    • http://depiberu.sgadventureeducation.com/uploads/1/3/2/6/132680896/3ee803033485c19.pdfIn PDF document text
    • http://bavibisu.seaofqibodywork.com/uploads/1/3/1/4/131412290/bunoridevokinimefa.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/ab20bca4-9fd2-4e01-b639-198a16ccc5b2/70127480189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81906ee1-fc74-47aa-9cc9-050a162adf9f/jepenojubirixobamigezij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd209401-0264-46be-9dbf-1a2c7fced46d/54774375467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96cf2625-ed31-4194-81d0-bedfc57489b8/78990041162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58d9ef35-a8cc-496a-9367-260f3634cf08/noxopugabujo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1013/8017/files/mowoma.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/7225/1814/files/vobikuputuk.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_off000081c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81C8 5544 bytes
SHA-256: 62e1f0352f286ec070aa48ee9ca1a92c5f959d3d743f9deff3f6703e7ce13194
font_01_sfnt_off000094b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94B1 10112 bytes
SHA-256: 5213a26cce6569fa795d8192b6213e149b80ca806b1ad721af34116d43ee2e68

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