Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc354cbbb147e77…

MALICIOUS

PDF

47.9 KB Created: 2020-09-01 11:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f9c23a190451babb22669243f4f0946 SHA-1: 7c109ab50bcc6c601ad358a1fe33eb1659d4850b SHA-256: 1fc354cbbb147e7795ba7fecb50c74572400ff129fac443aeb42d4619708e37a
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to potentially harmful external sites through these links, likely as part of a phishing or malware distribution scheme.

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.com/wix?keyword=mt643+allison+transmission+service+manual
    • https://cdn.shopify.com/s/files/1/0428/5415/4406/files/89850390453.pdf
    • https://cdn.shopify.com/s/files/1/0435/9028/7517/files/neoliberalismo_e_educao.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/schema_amplificateur_audio.pdf
    • https://cdn.shopify.com/s/files/1/0430/7651/8049/files/gajepumesiw.pdf
    • https://cdn.shopify.com/s/files/1/0439/3598/9915/files/gods_of_egypt_movie_download.pdf
    • https://static.usrfiles.com/ugd/de60da_34ff49d90e254dad8bfcf8cabe1ba035.pdf
    • https://static.usrfiles.com/ugd/e4a001_6ea1ad885be94ca4b2d7b50ccb2ab315.pdf
    • https://static.usrfiles.com/ugd/b88e3d_135d3dca58b94decb18c1a8543a980da.pdf
    • https://static.usrfiles.com/ugd/fedf23_6bf6c5a484244e948f30ed0ba1dcedbc.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7db22527f214238a72c8174f861dad6.pdf
    • https://static.usrfiles.com/ugd/b8c837_60ea1bff23664044a014429b477a79b6.pdf
    • https://static.usrfiles.com/ugd/8b9728_c3baf938e7a04a8fae353eb4138f0c27.pdf
    • https://static.usrfiles.com/ugd/b7ab08_b583d2c9b9f94f77b2528e4cab727501.pdf
    • https://static.usrfiles.com/ugd/c1108c_090ef04fb0d742e182618a3a02834d64.pdf
    • https://cdn.shopify.com/s/files/1/0438/0013/3793/files/dishonored_2_achievement_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5404/files/bisogubesoto.pdf
    • https://cdn.shopify.com/s/files/1/0440/2266/1278/files/celebrate_recovery_book_2.pdf
    • https://cdn.shopify.com/s/files/1/0462/2453/9802/files/jobim_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/4277/4935/files/5980798294.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_off000071ac.bin
2150941ae289f01284caefe382da96678e6c3c5e1a116d9862cfbbec6e006842		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71AC 5416 bytes
font_01_sfnt_off0000841a.bin
c396d8d74d98e5bfda43dee12ba8100c624cfc03b2ee4013906345299f211956		 pdf-font-stream PDF embedded font (sfnt) at offset 0x841A 14992 bytes

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