Malicious PDF — malware analysis report

Static analysis result for SHA-256 105251eb9387fb24…

MALICIOUS

PDF

42.7 KB Created: 2020-09-04 00:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c9bb2ca0572fae1e39c793f92f267af SHA-1: 5318102377361bbe75a931d08f5a8af2ff6614da SHA-256: 105251eb9387fb2443aa0375f1e04f0614f6f2868ce8d0bded9243810cae8727
162 Risk Score

Malware Insights

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

The PDF contains a lure to 'Atualizar whatsapp android 2018' and embeds a link to a known malicious redirector. The PDF also contains a large number of links to external PDFs, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of a download button lure further supports a malicious intent.

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.link/wix?keyword=atualizar+whatsapp+android+2018
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/2d1648_f0a6f2ee4a0a4938a44a9a325d78fc41.pdf
    • https://static.usrfiles.com/ugd/575363_455715da2d1843aea4167998cfd35d1b.pdf
    • https://static.usrfiles.com/ugd/ac51ce_a80db4be460b44f1b99b7c6f5fbc8a75.pdf
    • https://cdn.shopify.com/s/files/1/0438/1619/0112/files/ios_human_interface_guidelines_buttons.pdf
    • https://cdn.shopify.com/s/files/1/0429/6320/6307/files/dinuzepisojop.pdf
    • https://cdn.shopify.com/s/files/1/0434/1415/9521/files/87917600635.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/80232397285.pdf
    • https://cdn.shopify.com/s/files/1/0465/3550/8126/files/4391660766.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/benezudumasafarewe.pdf
    • https://cdn.shopify.com/s/files/1/0435/2868/3672/files/lixeluwivizelelejivuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/36954008485.pdf
    • https://cdn.shopify.com/s/files/1/0428/8872/4639/files/jikirezetojidon.pdf
    • https://static.usrfiles.com/ugd/575363_4d7940b6593546809c0664138e0e6dd8.pdf
    • https://static.usrfiles.com/ugd/9734e7_0c0c239b8e7f4d40b8e3cc3791b00b3e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b27.bin
33506aa70c5a8dd14162d20f571830d0e5d103e99f6ba30304ca98ef27a5e2e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B27 5460 bytes
font_01_sfnt_off00006db7.bin
17409f3811709a84f161cb26fd2e9b849f130fea0544fdcdb7c184487a3ab34b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB7 9956 bytes
font_02_sfnt_off00008fc8.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC8 4324 bytes

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