Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9160946ac037951…

MALICIOUS

PDF

42.1 KB Created: 2020-08-29 03:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11ab510968ee6e40508fc5656cde92fd SHA-1: 3fede73db3fabb5cce3e7721f8df9b31686af09b SHA-256: d9160946ac037951889960b89e5fcbd84e71eda7ff6547997e6d76ef1a660387
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends T1059.001 PowerShell

The PDF file contains a large number of embedded links, including a redirector to the known malicious URL https://ttraff.ru/wix?keyword=asian+kung+fu+generation+mp3. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests a phishing or malware distribution attempt. No scripts were extracted from this sample.

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.ru/wix?keyword=asian+kung+fu+generation+mp3
    • https://cdn.shopify.com/s/files/1/0443/6888/7964/files/56219266111.pdf
    • https://cdn.shopify.com/s/files/1/0427/5997/9174/files/dubikevaravaliselawuzikow.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/bloodshot_stronghold_puzzle.pdf
    • https://cdn.shopify.com/s/files/1/0428/5143/4659/files/vawegi.pdf
    • https://cdn.shopify.com/s/files/1/0436/0408/2851/files/ct_weather_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/6271/4773/files/bediwanine.pdf
    • https://cdn.shopify.com/s/files/1/0437/0900/5978/files/nuzebiwomisip.pdf
    • https://cdn.shopify.com/s/files/1/0434/0570/5374/files/65402977877.pdf
    • https://static.usrfiles.com/ugd/b8c837_df138d8e91464135ba6ad496f8f6ca03.pdf
    • https://static.usrfiles.com/ugd/b8c837_7dc2931988214758ae7ed0004285d4b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_8acb103638da477987d634ea67792e25.pdf
    • https://static.usrfiles.com/ugd/b8c837_be3586fe336944eb8ca9e74db2528cfd.pdf
    • https://static.usrfiles.com/ugd/b8c837_175f96dd976f40d58580415c47c74b16.pdf
    • https://cdn.shopify.com/s/files/1/0437/8935/3120/files/nadumupevidibimiwol.pdf
    • https://cdn.shopify.com/s/files/1/0433/0140/4830/files/bms_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/8711/0037/files/juliwuvabatibodirimegus.pdf
    • https://cdn.shopify.com/s/files/1/0431/0538/6647/files/ejemplos_de_actos_administrativos.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4870/files/balidin.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_off000065b2.bin
f7d9ea479a68d010904014a64e4ebae99de8b3f271a686652c71c766df9b7800		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B2 5404 bytes
font_01_sfnt_off00007802.bin
1b726d6d290dde3087676051708847d4d46170019c277591241623cfdaf2cdc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7802 10440 bytes

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