Malicious PDF — malware analysis report

Static analysis result for SHA-256 1371c90472646b6b…

MALICIOUS

PDF

43.3 KB Created: 2020-09-05 03:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02ea1a4ef9a0912c1bda1ed27d3a4596 SHA-1: 98caf49a93f54feb684bdd6b56d6db73a818d9b4 SHA-256: 1371c90472646b6b7d7563bf1b2a716284e14d1d039fe3bf161a667ef710dac3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to a malicious URL, masquerading as a download for Android Studio SDK. This is supported by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the embedded URL. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and the malicious URL, suggesting an attempt to trick the user into downloading a payload.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=android+studio+install+sdk+23
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b28561_de618565ebd44bd9be78e5397ca70f78.pdf
    • https://static.usrfiles.com/ugd/b47706_6f2ec6fc74d8401aa4f1f7e186e15e55.pdf
    • https://static.usrfiles.com/ugd/baef12_215a968704804f888a29b58d04bda8c1.pdf
    • https://cdn.shopify.com/s/files/1/0427/9051/8940/files/94486506377.pdf
    • https://cdn.shopify.com/s/files/1/0440/5461/0070/files/31503923188.pdf
    • https://cdn.shopify.com/s/files/1/0437/2122/8442/files/dudigitatewogoremefi.pdf
    • https://cdn.shopify.com/s/files/1/0435/8704/3496/files/marine_boilers_and_steam_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0435/1633/0152/files/roxugosatalilarexupab.pdf
    • https://cdn.shopify.com/s/files/1/0463/1878/0578/files/video_er_app_for_android_phone.pdf
    • https://cdn.shopify.com/s/files/1/0429/8326/0314/files/56041393170.pdf
    • https://cdn.shopify.com/s/files/1/0434/6337/7056/files/1233136046.pdf
    • https://cdn.shopify.com/s/files/1/0437/6638/2749/files/canadian_national_infrastructure_report_card.pdf
    • https://cdn.shopify.com/s/files/1/0439/8009/5646/files/39708266145.pdf
    • https://cdn.shopify.com/s/files/1/0435/6076/3555/files/sky_movies_tv_guide_tonight.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2902/files/yamaha_htr_5940_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9645/7884/files/luwekunupobaxekek.pdf
    • https://cdn.shopify.com/s/files/1/0438/5685/5190/files/24877261015.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bbc.bin
a28c7ef52db158d515aff7601bbaf92de3d7e0727b4593ea8ced4291d577ce8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBC 5168 bytes
font_01_sfnt_off00007d5e.bin
efec777ffd34b0accb3fbf1a11247dd99c1607b04e77b489591145e637a35dba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D5E 10308 bytes

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