Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e05c123dfc6a0b5…

MALICIOUS

PDF

37.0 KB Created: 2020-08-08 01:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dee31c8c29a67b9f6a7e121c9379ce14 SHA-1: 82a43d4a87adf791050db9ef43c19bf2ad5bce20 SHA-256: 3e05c123dfc6a0b5ae48156500c6933800a76eb93153238456fee384dc6a18d2
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though obfuscated, contains the malicious URL, suggesting the primary intent is to lure the user to a malicious site via these links.

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.com/pify?keyword=edge+barracuda+buggy+plans+pdf
    • http://files.dancefitstudio.com/uploads/1/3/2/6/132695525/jejupisejaseb.pdf
    • http://files.anewimagesalonanddayspa.com/uploads/1/3/1/1/131164572/47fc1f448c4.pdf
    • http://files.yedragonsden.com/uploads/1/3/1/3/131379530/kawetezov-loxinog-fagob.pdf
    • http://files.aquafloradesign.com/uploads/1/3/0/7/130776150/tufekutan-remif-kasusabuk-manil.pdf
    • https://cdn.shopify.com/s/files/1/0431/5290/0250/files/megolaxodemefixoda.pdf
    • https://cdn.shopify.com/s/files/1/0432/1024/4260/files/75669285942.pdf
    • https://cdn.shopify.com/s/files/1/0434/7474/7558/files/export_dataframe_to_csv_r.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/51565778713.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/buronutabazoralapupevabe.pdf
    • https://cdn.shopify.com/s/files/1/0441/3744/7576/files/best_ds_emulator_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0440/1473/1429/files/amls_2020_2da_edicion_descargar_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0433/5042/5750/files/86384308532.pdf
    • https://cdn.shopify.com/s/files/1/0444/0922/5382/files/el_libro_rojo_de_carl_jung.pdf
    • https://cdn.shopify.com/s/files/1/0435/9726/7112/files/dafalomidavabakurepok.pdf
    • https://cdn.shopify.com/s/files/1/0436/8223/4521/files/cloud_atlas_soundtrack.pdf
    • https://cdn.shopify.com/s/files/1/0437/0871/1080/files/57768148201.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/wuwejatiro.pdf
    • https://cdn.shopify.com/s/files/1/0430/5531/7149/files/tumozijizobunadimuborara.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_off00005193.bin
57037886a4380457079f147436d61be7809c01b775266fcee8f5df420ba59397		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5193 5520 bytes
font_01_sfnt_off00006475.bin
73da12a70d1105b8526e051375ad2e4cbec7ee6ea2abd85b03a33f202831211d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6475 10116 bytes

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