Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac936cba48bdd3f…

MALICIOUS

PDF

44.4 KB Created: 2020-08-19 00:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a3bab7ae7dec0e1129e39b9cabc6b10 SHA-1: 98bf62cf842ed38cbd6591e31e6b2e8f9a0f9d4d SHA-256: 9ac936cba48bdd3f875c2ed4a758d7df147ff04bb27e03edf5a825c726095027
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://ttraff.cc/pify?keyword=best+fitted+sheet+for+king+size+bed, which is a known malicious redirector. The document body contains obfuscated text and a reference to this malicious URL, further supporting the malicious intent. No scripts were extracted, limiting the analysis of direct payload execution.

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=best+fitted+sheet+for+king+size+bed
    • http://files.spotteddairyair.net/uploads/1/3/1/0/131071258/8f1fe775233.pdf
    • https://cdn.shopify.com/s/files/1/0434/7356/7901/files/kabofabakopigin.pdf
    • https://cdn.shopify.com/s/files/1/0434/3644/1767/files/torch_browser_windows_7_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/2548/9305/files/tactics_for_listening_tapescript.pdf
    • https://cdn.shopify.com/s/files/1/0427/7580/6119/files/4013028411.pdf
    • https://cdn.shopify.com/s/files/1/0438/4089/7174/files/73985128537.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/top_browser_apps_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/wepemudofukinojepot.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexanenivoxepabulolud.pdf
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/boxejumifadararimesisone.pdf
    • https://cdn.shopify.com/s/files/1/0437/6379/4069/files/innovation_funnel_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/wakule.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_off00006ee0.bin
976a8c18111cef4a3426545d0ad410a4a11ec921903b822eac815cd008da7293
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE0 5228 bytes
font_01_sfnt_off000080ac.bin
5b765c22a6a2b8a674bff1ad04c939510b4986a01d91e0fb13b1c1655bf945e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x80AC 10572 bytes