Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b110416e8d352ba…

MALICIOUS

PDF

57.7 KB Created: 2020-08-30 05:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 090a8a3a7949485bbce04cf1ca5ed1ee SHA-1: d0ba8ea128e9093c85771f9e65407b0379358ae4 SHA-256: 0b110416e8d352ba4a6e3755728aef3c57a3e543f67be8eb3552df911f5db27b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains the same malicious URL. This suggests the primary goal is to redirect the user to a malicious site, likely for further exploitation or phishing.

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.ru/wix?keyword=from+pieces+to+weight+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3967/7855/files/meruziwume.pdf
    • https://cdn.shopify.com/s/files/1/0433/7057/8070/files/reforma_anglicana_inglaterra.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6556/files/physics_punjab_textbook_class_12.pdf
    • https://cdn.shopify.com/s/files/1/0435/3002/7157/files/texezir.pdf
    • https://static.usrfiles.com/ugd/b48b60_eca68b9cad8f41fb8449b1e94898273f.pdf
    • https://static.usrfiles.com/ugd/2e16aa_52d5d9c7add841c58abaeb8a0072e1e6.pdf
    • https://static.usrfiles.com/ugd/ade4e6_e0b539c75c6f47e3ba5179daa9c7984b.pdf
    • https://static.usrfiles.com/ugd/b8c837_21a1103e3d4d47baa08e31105c826bcb.pdf
    • https://static.usrfiles.com/ugd/353d00_2006be9288bc462dbc9e311fa3afada3.pdf
    • https://cdn.shopify.com/s/files/1/0430/1701/1353/files/10313324581.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/21313895024.pdf
    • https://cdn.shopify.com/s/files/1/0433/8640/5022/files/maths_quadratic_equations.pdf
    • https://cdn.shopify.com/s/files/1/0431/8212/9320/files/edit_change_text_color.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuvekalododit.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/56570243124.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5256/files/primary_english_grammar_book.pdf
    • https://cdn.shopify.com/s/files/1/0438/2618/4352/files/anesthesia_secrets_5th_edition.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_off0000a515.bin
0df4e4c35456367b484231025fde8e51996f8138ddabfa77d20a4d8274b15408		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA515 5376 bytes
font_01_sfnt_off0000b750.bin
4e92037a03708480dd0a8cfe86ba9da1b8a4c6b92a64b656a519ea97f73cdad1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB750 10120 bytes

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