Malicious PDF — malware analysis report

Static analysis result for SHA-256 737d86ddf6c83ac2…

MALICIOUS

PDF

40.7 KB Created: 2020-08-14 15:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d88a359deeedfa945518c2b49a21bf8 SHA-1: 95929d089dbdf69da630e3ffa158a66461fadb08 SHA-256: 737d86ddf6c83ac21372f7af80a2e992869366dea1fd192ff392f39f39c96d4d
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics. The presence of a 'download button' heuristic suggests a lure to download further content. The ML classifier strongly indicates maliciousness.

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=best+5+minute+guided+meditation+app
    • http://sipujobi.oldgoatlures.com/uploads/1/3/1/4/131453134/kufusakowe.pdf
    • http://files.stmaryselmbridge.org/uploads/1/3/0/7/130739532/42508fd95.pdf
    • http://files.singlefathersthroughsurrogacy.com/uploads/1/3/1/4/131407818/768332a415925.pdf
    • http://kegipip.drainsmith.com/uploads/1/3/1/3/131384016/323d40ae1.pdf
    • http://files.ssejinja.org/uploads/1/3/1/1/131163615/kasululibuwotev_xirofedetamugot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7485/5846/files/xuwizuxuzezalu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4605/0714/files/3.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/didimebire.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4827/files/luvinifuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/78432732018.pdf
    • https://cdn.shopify.com/s/files/1/0445/6411/9716/files/jivusi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/siwesuwenekinu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9479/3635/files/jexab.pdf
    • https://cdn.shopify.com/s/files/1/0433/3119/0952/files/javascript_encryption_libraries.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nisexabidubukov.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7764/files/52599209631.pdf
    • https://cdn.shopify.com/s/files/1/0445/6005/6479/files/61836098794.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_off000060c2.bin
e3d1b397c806c6de8c2caac8e0ebc599a50b1213b880afb2d168894bef185871		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C2 5324 bytes
font_01_sfnt_off000072ca.bin
4d6d5ae6288c09e88f77016516a83fed696d484f891caadfefbbeff91232a39b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72CA 10232 bytes

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