Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0c8581676b0396…

MALICIOUS

PDF

44.6 KB Created: 2020-08-09 10:40:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77416ae98f8294fc78cceb71dabaebde SHA-1: b79343dabe2c04dfe635b49cbbac110e0a8ba97b SHA-256: 5b0c8581676b0396d151d043caf9c1732dd9f2b122a17a7a50ca81e79ab7e2fc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for 'business source documents'. The presence of a link farm and a malicious redirector suggests an attempt to lead the user to a compromised or malicious site, likely for further exploitation or credential harvesting.

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/pify?keyword=business+source+documents+pdf
    • http://gawofixej.lueveasdreamtoreality.com/uploads/1/3/1/4/131453194/tobodopud-nanivof.pdf
    • http://files.ingridlavoiepapercutting.com/uploads/1/3/0/7/130740571/ca1895294b055f1.pdf
    • http://files.simplysignsofgranby.com/uploads/1/3/2/6/132681579/mikuxexena.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7346/0641/files/69635681225.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5897/files/dunitedageko.pdf
    • https://cdn.shopify.com/s/files/1/0429/7018/5879/files/basics_of_electrical_engineering_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0432/4291/3952/files/defebiwuxinikeriku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bararilisubolubudikolumo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2140/9184/files/99589213089.pdf
    • https://cdn.shopify.com/s/files/1/0433/6402/4479/files/soxonowudotu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3462/files/96891039948.pdf
    • https://cdn.shopify.com/s/files/1/0437/6661/2130/files/2008_vw_passat_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/lozireje.pdf
    • https://cdn.shopify.com/s/files/1/0434/8621/6352/files/genojajorumo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7789/4293/files/16913998739.pdf
    • https://cdn.shopify.com/s/files/1/0435/9376/0931/files/number_theory_solution.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_off00007292.bin
3438c43f18dc8235a5c03c3b8a576bf4a466deb2fff7a4149bba825cdadd3a49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7292 5108 bytes
font_01_sfnt_off000083e1.bin
336a1ddf438ec8cd98ead74e671651f02a0876bb2bf320f499ff5c00aa61cd98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E1 9900 bytes

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