Malicious PDF — malware analysis report

Static analysis result for SHA-256 184ca3b6bc567026…

MALICIOUS

PDF

55.2 KB Created: 2020-08-04 10:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7aa63a17d8ea7cae6944301020711cb8 SHA-1: 90f63a1aa2b7d9a54e9b390e9343c7c5286eb3cd SHA-256: 184ca3b6bc56702616567acce093cb57994a03f97559f0c01cb33654b0bc5b7f
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure for 'advanced excel practice exercises pdf'. The presence of a link farm and a malicious redirector indicates an attempt to drive traffic to malicious sites, likely for further exploitation or phishing.

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.ru/pify?keyword=advanced+excel+practice+exercises+pdf
    • http://gututeg.kmccreations.com.au/uploads/1/3/1/4/131453850/rujovivavanagabol.pdf
    • http://files.lovelivesfoundation.com/uploads/1/3/2/7/132740237/livasijix_guwiravilo.pdf
    • http://files.communitychurchofpraise.com/uploads/1/3/1/4/131482931/7b5677722b32c7.pdf
    • http://files.zaccheosgunsmith.com/uploads/1/3/1/6/131607027/b45df1e.pdf
    • http://files.nikkileahdesigns.com/uploads/1/3/0/7/130776141/zezovafu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/tojinedetit.pdf
    • https://cdn.shopify.com/s/files/1/0444/1748/2919/files/acls_study_guide_2015.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4172/files/53229597873.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/moxudenolaruxorurafugi.pdf
    • https://cdn.shopify.com/s/files/1/0438/1822/1730/files/56244704673.pdf
    • https://cdn.shopify.com/s/files/1/0437/6766/0706/files/poxamewirap.pdf
    • https://cdn.shopify.com/s/files/1/0433/2906/1032/files/how_to_generate_random_numbers_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0433/4472/4133/files/wibifodikapulilokijo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35209966956.pdf
    • https://cdn.shopify.com/s/files/1/0433/3718/7493/files/voxogapeginobisagube.pdf
    • https://cdn.shopify.com/s/files/1/0433/3626/9983/files/57617255139.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077df.bin
41d8d4d1a661e9334f108c18dbd4812dce169e8577eda3e3f01d87b57d3f9a33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77DF 4944 bytes
font_01_sfnt_off000088ba.bin
dc663b9d649745909cf0194d7ac12299061d5c893c5a6f012377ccd1021e7617		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88BA 10204 bytes
font_02_sfnt_off0000abeb.bin
2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABEB 16144 bytes
font_03_sfnt_off0000c0ea.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EA 4324 bytes

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