Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad0081987ffa75c…

MALICIOUS

PDF

44.7 KB Created: 2020-08-23 01:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d67759b20ce9f327f588b62cd2aa8ec8 SHA-1: ae8a24c136073eb9cbb23c314751fcd4fe10d480 SHA-256: 5ad0081987ffa75ce30d483654c303f02a8a2974bfa286ecd1c7d44516700cd2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm. This suggests the document is designed to funnel users to malicious sites under the guise of providing access to various PDF resources.

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=biological+psychology+rosenzweig+pdf
    • http://files.amandacimaglia.com/uploads/1/3/0/7/130740256/3875364.pdf
    • http://files.wcapiary.com/uploads/1/3/2/6/132680822/2509139.pdf
    • http://jiwiwuju.djsteffencoonan.com/uploads/1/3/1/3/131382406/a5c05be12428.pdf
    • http://dapefa.utahstudentnurse.org/uploads/1/3/1/4/131438304/vezoziwofu-nobizobenofusu.pdf
    • http://files.jcovercomersministries.net/uploads/1/3/1/4/131453276/damobudebateditejuwe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0454/9489/4744/files/maus_graphic_novel_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5512/7459/files/zajakepepolebubuwer.pdf
    • https://cdn.shopify.com/s/files/1/0428/8770/8825/files/23837352441.pdf
    • https://cdn.shopify.com/s/files/1/0435/1308/6106/files/98018101868.pdf
    • https://cdn.shopify.com/s/files/1/0434/8179/2664/files/54270503993.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/2nd_conditional_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/73680947680.pdf
    • https://cdn.shopify.com/s/files/1/0430/8697/1033/files/calculator_program_in_android_using_switch_case.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/11571252433.pdf
    • https://cdn.shopify.com/s/files/1/0433/8922/3066/files/potekevefizavikixapeg.pdf
    • https://cdn.shopify.com/s/files/1/0428/7086/6079/files/mla_citation_format_website_example.pdf
    • https://cdn.shopify.com/s/files/1/0437/1618/2166/files/intoxicacion_por_aflatoxinas_en_bovinos.pdf
    • https://cdn.shopify.com/s/files/1/0438/2969/0525/files/pioneer_vsx_820_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/interview_questions_on_control_system_and_answers.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_off00006f40.bin
882d6e40698fc45e31ec81de7a226a9c25855943437d1a4a28381b104a692c99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F40 5708 bytes
font_01_sfnt_off000082ba.bin
7e4a70582bfb6ed09f2c8d91caa63e61a3d64ae9f936cd8bc78886dc9e161773		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82BA 10192 bytes

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