Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ed84909c0d5800…

MALICIOUS

PDF

46.8 KB Created: 2020-08-29 01:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dec77adcd7ba45eedc5c3d4c86484525 SHA-1: 4d417782b3e71a8e4f8a90d58f058020dba46f17 SHA-256: a4ed84909c0d580006f93147b454ec96041f4700711e354de8794e9a17ce0aa7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a prominent link that redirects to a malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'Minecraft unblocked' and the malicious URL, suggesting a lure for users seeking game downloads. The PDF_SEO_LINK_FARM heuristic indicates the PDF is part of a larger link farm, likely for SEO manipulation or distributing malicious links. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this PDF.

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.cc/wix?keyword=minecraft+unblocked+1.5.2+google+drive
    • https://cdn.shopify.com/s/files/1/0432/1175/1579/files/thrombectomy_for_stroke_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0437/7103/5809/files/lugekimobidij.pdf
    • https://cdn.shopify.com/s/files/1/0434/9558/8005/files/jitazuvezejuzubararibom.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2581/files/42665899918.pdf
    • https://cdn.shopify.com/s/files/1/0430/1943/6185/files/65246604357.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e251d56313340988d39db694fd9b73b.pdf
    • https://static.usrfiles.com/ugd/b8c837_42f181e00a294d89978bc9d24152c657.pdf
    • https://static.usrfiles.com/ugd/b8c837_aeb2c51e61864088a723f52a2f679481.pdf
    • https://static.usrfiles.com/ugd/b8c837_30f19c0fba7248dabc7a34a6b1cc3b44.pdf
    • https://static.usrfiles.com/ugd/b8c837_f37581e6b5b8477bbcd8c677da0a617f.pdf
    • https://static.usrfiles.com/ugd/b8c837_0827ac60d8f445adb3d7860bebf65dfd.pdf
    • https://static.usrfiles.com/ugd/b8c837_9261417b23ee47ed882b883124e8146f.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e7b5ca34de4477683cca469eae79e17.pdf
    • https://cdn.shopify.com/s/files/1/0430/5059/8562/files/43719599322.pdf
    • https://cdn.shopify.com/s/files/1/0432/6952/1568/files/25662069268.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54101174921.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005253.bin
6a334324b47dfb0a0cdec69a6a88d43215b73a00da55bcee55289d79bb1895ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5253 5500 bytes
font_01_sfnt_off00006524.bin
67f504756ea61dd5c225297a0a9966e0d1fce543df51f67b9ddc24b692c611eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6524 10448 bytes
font_02_sfnt_off0000890e.bin
b0fa52173cf04b285f5a6379e59dbec661bcf0e06b6cb6d2876f3e95daaaabac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x890E 16116 bytes
font_03_sfnt_off00009dea.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DEA 4324 bytes

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