Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a04f36e6647c9bd…

MALICIOUS

PDF

44.3 KB Created: 2020-08-28 06:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38acd590c2797ac760904fecd023e577 SHA-1: 1638e931e51d439a962045d4adeb72f7a899bba0 SHA-256: 0a04f36e6647c9bd6c1cda0c85f697c1b463185ad9295d9e53389a0d5166f620
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=comic+book+price+guide+free+pdf+download`. This URL is presented within the document body as a lure for a free PDF download. The document also contains a large number of external PDF links, many pointing to Shopify domains, suggesting a link farm for SEO manipulation or to host further malicious content. The ML classifier strongly flagged this PDF as malicious.

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=comic+book+price+guide+free+pdf+download
    • http://files.kenmauronmusic.com/uploads/1/3/0/7/130775257/4662637.pdf
    • http://zubuwelu.tynycoedsurgery.com/uploads/1/3/1/3/131384709/kafupiz-vasavemowagek-vupas.pdf
    • http://purexeja.regenerateyourauthenticnature.com/uploads/1/3/1/4/131483036/xozol_jinuxofibuko.pdf
    • http://files.paulquinndistrict-amec.org/uploads/1/3/2/6/132695566/towojevogeg_tozozo_sitebufugela.pdf
    • http://kefef.brolouiscanter.com/uploads/1/3/1/6/131637030/dudisuwe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9650/6521/files/71712450978.pdf
    • https://cdn.shopify.com/s/files/1/0434/5911/7206/files/36675237929.pdf
    • https://cdn.shopify.com/s/files/1/0472/3268/0101/files/dapol.pdf
    • https://cdn.shopify.com/s/files/1/0436/9947/0486/files/college_algebra_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/9560/3880/files/attilio_meucci_risk_and_asset_allocation.pdf
    • https://cdn.shopify.com/s/files/1/0435/1030/0831/files/16937877829.pdf
    • https://cdn.shopify.com/s/files/1/0428/8364/5599/files/bovujet.pdf
    • https://cdn.shopify.com/s/files/1/0431/7144/6939/files/55049891426.pdf
    • https://cdn.shopify.com/s/files/1/0435/3461/4688/files/nivokulatafupidulajeg.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_off00006d53.bin
d0fe1e2771374e58e4e4217ccf20d5c0ae6fde002c7a38c78087a908e245dc04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D53 5496 bytes
font_01_sfnt_off00007ffb.bin
5c4ac2f708de4fe5adaaf7ab4dd9cdba9f160340e7a7b964d617d6e4dc4bc199		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFB 10704 bytes

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