Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ed8fc86dcb7e2e…

MALICIOUS

PDF

40.7 KB Created: 2020-08-25 12:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fef99d419066a074259f94787a1d93a9 SHA-1: 831c14509691cb9667dcbd6984e402f7bf6c6273 SHA-256: 12ed8fc86dcb7e2e1181729f8384f57f8a57620467e62386dc83af36b0f56763
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific URL identified as a malicious redirector. The document body, though partially corrupted, contains text related to an 'audit report' and includes the malicious URL, suggesting a lure to a malicious site. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points to a link farm or redirection strategy.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.ru/pify?keyword=adverse+audit+report+sample+philippines
    • http://jatizu.josefjakobs.com/uploads/1/3/2/7/132740978/xukuvobirizoj_supitojepubu_nuliwozin_bisegodezevosiw.pdf
    • http://files.newglobalimage.org/uploads/1/3/2/3/132303163/4008708.pdf
    • http://buxek.sayyestothecake.com/uploads/1/3/1/0/131070355/bufopupuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0615/6190/files/88668812313.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2894/files/radio_button_tkinter.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68905528383.pdf
    • https://cdn.shopify.com/s/files/1/0440/2790/4165/files/sinus_lift_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0433/9856/1948/files/bobine_lectrique.pdf
    • https://cdn.shopify.com/s/files/1/0432/9707/9460/files/calcifying_odontogenic_cyst.pdf
    • https://cdn.shopify.com/s/files/1/0444/4202/6150/files/gigaware_usb_to_serial.pdf
    • https://cdn.shopify.com/s/files/1/0428/9167/3763/files/oracle_java_jdk_8_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/3359/0940/files/futefelalakijem.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/92032975301.pdf
    • https://cdn.shopify.com/s/files/1/0434/5079/4145/files/26929212921.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_off00006217.bin
2750e8ef015b986a0cf2db453fa0d025dfa9ec9c81ffa0857ce40a7e76b39891		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6217 5248 bytes
font_01_sfnt_off000073c8.bin
2e28a8338f1eaca490cf54aca01aadfe73fe38cb45a5e96aebb11a57d282511e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C8 10120 bytes

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