Malicious PDF — malware analysis report

Static analysis result for SHA-256 64cd848d9058458b…

MALICIOUS

PDF

41.8 KB Created: 2020-08-14 20:39:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d15e98c0bf58423447ceadf442ae8b5 SHA-1: 8b7f30c6f9e42557c8720abf8415f525a7df6ecd SHA-256: 64cd848d9058458b149b46ab55a29422f82bfd622ac37d6f7be41b95e71214c3
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to malicious infrastructure, indicating a phishing or scam attempt. The embedded document body text, though heavily obfuscated, contains a URL that points to a redirector, which in turn links to a large number of other PDFs hosted on Shopify. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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=cladding+sheets+ireland
    • http://files.allfloridapaint.com/uploads/1/3/0/9/130969633/591341.pdf
    • http://files.einlothfinefurniture.com/uploads/1/3/2/6/132683328/f0bb4dabf9.pdf
    • http://files.communitysystemsfoundation.org/uploads/1/3/1/6/131636872/wapejufefadele.pdf
    • http://files.crossfit-galveston.com/uploads/1/3/2/7/132740511/6025675.pdf
    • http://bijizovo.subjectmattertap.com/uploads/1/3/2/6/132681670/lirexapowi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56773010908.pdf
    • https://cdn.shopify.com/s/files/1/0436/8351/2473/files/64409781800.pdf
    • https://cdn.shopify.com/s/files/1/0437/5783/0298/files/punalona.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20675343362.pdf
    • https://cdn.shopify.com/s/files/1/0434/7330/5750/files/xovodasixire.pdf
    • https://cdn.shopify.com/s/files/1/0431/7347/8560/files/dofetafuwipato.pdf
    • https://cdn.shopify.com/s/files/1/0435/6440/0798/files/taxujad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/kigiwum.pdf
    • https://cdn.shopify.com/s/files/1/0434/6170/5890/files/90467025154.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_off00005eda.bin
a6489c151c3bbc67d20d9ab9a85eb9ac39b3d7d4cd4a9a03e1dc6b35d18b3024		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDA 4992 bytes
font_01_sfnt_off00006fc4.bin
20de7922ca6d98553cbe736958d9113dc24cd1de52c9766d577ca3cee050fa8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC4 13356 bytes

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