Malicious PDF — malware analysis report

Static analysis result for SHA-256 04407ae3df563b4a…

MALICIOUS

PDF

46.5 KB Created: 2020-08-19 18:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3f42c469a828015c38cc0c289ec0cb3 SHA-1: 27bd5e490ff98f2c6771b4752c3d8d4adee07253 SHA-256: 04407ae3df563b4adf675183906a12817a4763d2a585adb63e6cb500b92dbcb2
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of external PDF links, suggesting a link farm or redirection scheme. The presence of a 'download button' lure further supports a malicious intent to redirect the user to potentially harmful content. No scripts were extracted, but the overall structure and embedded links indicate a phishing or redirection attack.

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/pify?keyword=bitdefender++2018+free
    • http://files.holywaterbooks.com/uploads/1/3/2/7/132740553/joduko-gagifademibafef.pdf
    • http://files.stateofappalachia.org/uploads/1/3/1/1/131163684/39aacc.pdf
    • http://files.mypawsragdolls.com/uploads/1/3/0/8/130814297/9535608.pdf
    • http://durip.fingers4hiretranscription.com/uploads/1/3/1/4/131437130/1899151.pdf
    • http://files.hurlyvaleprimary.co.za/uploads/1/3/1/3/131380728/xepajupimaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1030/9787/files/11044136737.pdf
    • https://cdn.shopify.com/s/files/1/0432/7564/9180/files/grammar_for_ielts_writing_a_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0449/4472/0040/files/marketing_strategy_definition.pdf
    • https://cdn.shopify.com/s/files/1/0429/5376/9126/files/gemajavaxijajupanutov.pdf
    • https://cdn.shopify.com/s/files/1/0432/7188/0870/files/kotago.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8041/files/bach_goldberg_variations_piano.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/24375498268.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/powopisizibojopabubefu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58933331969.pdf
    • https://cdn.shopify.com/s/files/1/0428/6208/4262/files/cagliari_bus_map.pdf
    • https://cdn.shopify.com/s/files/1/0438/5302/1344/files/96888126464.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2901/files/77292123746.pdf
    • https://cdn.shopify.com/s/files/1/0437/1929/5130/files/mozoxomenu.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_off000079e0.bin
14e278ad68e0304a73667ddb04a2da6c8d5ae5e0ce2214dbd85bb12d78b9ec56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E0 5048 bytes
font_01_sfnt_off00008b1f.bin
cd1bd1c958ac554088eaebee087ad522fb21e11c216166922a18440d6c868092		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1F 9932 bytes

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