Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1fb22a6d50f1ad…

MALICIOUS

PDF

43.6 KB Created: 2020-08-22 06:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85a41be3584cedd66f98915fb7d3c7a6 SHA-1: 2779c28489859e75b56461b54f0cba9bda2762eb SHA-256: 6a1fb22a6d50f1ad0695a66ee524443cf48692897c1623151f8cd4cbc36a3299
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of an advance-fee scam and a browser installation lure. It contains a link to a known malicious redirector, https://ttraff.cc/pify?keyword=android+browser+hijack, which likely leads to a site attempting to trick the user into installing malicious software or extensions. The document also hosts a large number of other PDF links, suggesting it is part of a link farm designed to improve SEO for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=android+browser+hijack
    • http://files.fundep.org/uploads/1/3/2/7/132740467/1075907.pdf
    • http://files.kurtweissgerber.com/uploads/1/3/0/7/130775583/8036038.pdf
    • http://files.bearsreg.com/uploads/1/3/1/3/131379406/binejexobika.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7051/1521/files/cours_et_exercices_d_anglais_3eme.pdf
    • https://cdn.shopify.com/s/files/1/0433/9482/6396/files/harry_potter_potions_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/6982/4414/files/apostasia_en_la_iglesia_cristiana.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20931566490.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8815/files/bisoba.pdf
    • https://cdn.shopify.com/s/files/1/0437/5363/5989/files/51321882104.pdf
    • https://cdn.shopify.com/s/files/1/0434/3080/5669/files/15588442651.pdf
    • https://cdn.shopify.com/s/files/1/0433/9020/6117/files/kixojidapuni.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/tilusokiwodokaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/9940/5977/files/nissan_odometer_statement.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/31349146302.pdf
    • https://cdn.shopify.com/s/files/1/0430/5531/7149/files/41718875214.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_off00006b27.bin
2030e96562849e8718ecd446cf78ac2429e86047ebfa8517356ac34ec19fd85a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B27 5356 bytes
font_01_sfnt_off00007d61.bin
f422a0a61076a3697a725873ccabc082c30a56ba88c02ba7cb05f3f783ebc336		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D61 10608 bytes

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