Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff51add2074ae0f2…

MALICIOUS

PDF

50.9 KB Created: 2020-09-21 01:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d36e8589b09892d74802bc0c111ecb70 SHA-1: b8c0c97376862597bdeaa3490b39e05836ec5c52 SHA-256: ff51add2074ae0f234c9774c92e9b3c8cfaecde8c196a6ea6bf4f3af0edf5777
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.club/wix?keyword=open+network+linux+tutorial', which is likely the initial lure. The presence of a link farm suggests an attempt to obscure the final malicious destination and potentially engage in SEO poisoning to attract victims.

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 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.
  • 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/wix?keyword=open+network+linux+tutorial
    • http://files.wood-honey.com/uploads/1/3/0/7/130776197/kofekisowimibij.pdf
    • http://misefiz.cambridgeintlschool.com/uploads/1/3/1/3/131383541/bced432f6.pdf
    • http://nezedirej.montrealhighlandgames.com/uploads/1/3/2/6/132695252/e1818c8.pdf
    • http://wusos.ashlynnsboutique.com/uploads/1/3/1/4/131437594/tuganixesifatur.pdf
    • http://files.mykidshavepawsvet.com/uploads/1/3/0/8/130814717/girusejetaxil.pdf
    • https://fcb41725-5c29-4684-89c3-f1d81d07c071.filesusr.com/ugd/cd81e9_ad4a397db5914f528684be4304b2101e.pdf?index=true
    • https://e9175f8e-ab20-4039-812f-4bceb964af08.filesusr.com/ugd/6cabbb_1b3b76b5800249439bd26f78eab8e623.pdf?index=true
    • https://bb9f4e68-16a8-4aa4-8923-9be11113fb4f.filesusr.com/ugd/dfb5f8_41e5c1350bd9459c81bea5911e91e830.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0461/1620/8804/files/cambridge_english_exams.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/59568363072.pdf
    • https://cdn.shopify.com/s/files/1/0482/6434/7809/files/jadalugumamipagumata.pdf
    • https://cdn.shopify.com/s/files/1/0440/0116/5462/files/aditya_birla_sun_life_insurance_nomination_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/5672/6170/files/taxekuwibimusetamavepuge.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/85987113776.pdf
    • https://cdn.shopify.com/s/files/1/0427/3229/0215/files/tunijuxuvaxazutaxopal.pdf
    • https://cdn.shopify.com/s/files/1/0478/4055/9263/files/61226637196.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d51.bin
1183a74c585a99de79c009336a2d89f5d6afa2e608cdb26bb9ff82d5f5d8d589		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D51 4884 bytes
font_01_sfnt_off00008e0f.bin
159b656bcfde9f3884d46e0729f4ce6c2950eec31adcbd23ff0566d3797c68ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0F 15828 bytes

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