Malicious PDF — malware analysis report

Static analysis result for SHA-256 489fb7a4628e3694…

MALICIOUS

PDF

43.6 KB Created: 2020-08-07 20:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcee868834123004f9cc013d2df1b544 SHA-1: ed4ef22144d79a44d371fe70390b49ae294a2339 SHA-256: 489fb7a4628e369411959c01d55eb50df5f121c03e13c8a071498481ebeec25a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large external PDF link farm. The primary malicious URL identified is https://ttraff.cc/pify?keyword=atos+institucionais+ditadura+pdf, which is likely used to redirect users to a malicious site. The document body contains obfuscated text and numerous URLs, supporting the conclusion that this PDF is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=atos+institucionais+ditadura+pdf
    • http://files.marisakeller.com/uploads/1/3/2/6/132682295/a7277d5967f3e6.pdf
    • http://dazumu.johnsgiftsnc.com/uploads/1/3/0/8/130813765/viduzejefedux_vipok_suzavaduwafunuv.pdf
    • http://files.hugheslandscaping.com/uploads/1/3/0/8/130813612/seketelab_xumanagas_gakazotija_zoziz.pdf
    • http://files.rithillel.org/uploads/1/3/1/4/131406275/padotopemi-gusupub-rusonusabizipix-ratepexuwoxaja.pdf
    • http://files.stylebybarbara.com/uploads/1/3/0/8/130874115/tozifek.pdf
    • https://cdn.shopify.com/s/files/1/0432/3485/3021/files/asean_charter_pdf_bahasa_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0099/files/vapusepivufunerodituweg.pdf
    • https://cdn.shopify.com/s/files/1/0433/9073/0398/files/nazewikebozog.pdf
    • https://cdn.shopify.com/s/files/1/0433/9515/4070/files/tekavo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1140/files/tekojawolide.pdf
    • https://cdn.shopify.com/s/files/1/0432/2508/8168/files/sublime_directory_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0440/1060/2661/files/belarus_visa_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70913092576.pdf
    • https://cdn.shopify.com/s/files/1/0431/5522/6773/files/pukejitiladekos.pdf
    • https://cdn.shopify.com/s/files/1/0437/0307/4971/files/51645996008.pdf
    • https://cdn.shopify.com/s/files/1/0430/8995/2922/files/xisedasuxanexogekuwip.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067c0.bin
3b2afbcb075a21b84b3f58b103a1e51e051ea15e78258ebff81421ba3505dc1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C0 5104 bytes
font_01_sfnt_off00007930.bin
71242238213ad33f71237aea85143a10e492fe4ca4cf6e0670132ffbcf084136		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7930 12836 bytes

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