Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba9dca466459c2f3…

MALICIOUS

PDF

45.6 KB Created: 2020-08-08 19:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7382c25c40e003952ebf4a986fbfb8f SHA-1: c2b39ecda5eb614dd13dd6d6edd3e3d512cf84c5 SHA-256: ba9dca466459c2f3bb1a55950f16b5646c08401eb32914e46bc95d80c70ed30d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The primary attack pattern involves redirecting the user to external, potentially harmful, sites.

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=cell+cycle+control+system+pdf
    • http://files.alishahenry.com/uploads/1/3/0/7/130739163/bapisozivowoja.pdf
    • http://files.marinferry.com/uploads/1/3/0/9/130969960/7ecafc5de.pdf
    • http://files.fionacompton.com/uploads/1/3/2/6/132681824/tulotezeniramo_wobalefadan.pdf
    • http://files.englishestateservices.com/uploads/1/3/1/3/131398244/xipamadulowukemuv.pdf
    • http://files.hollandwalks.nl/uploads/1/3/0/8/130874012/wanuwa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9177/2063/files/durable_power_of_attorney_new_york_state.pdf
    • https://cdn.shopify.com/s/files/1/0448/1040/4000/files/calligraphy_exercises_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0434/8785/4749/files/kozogikoribagawexanis.pdf
    • https://cdn.shopify.com/s/files/1/0432/2151/6448/files/gogijawobitukituw.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9051/files/foxosopu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3615/files/learning_strategies_definition.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9382/files/89311249503.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/search_text_in_outlook.pdf
    • https://cdn.shopify.com/s/files/1/0430/7153/7301/files/pdf_editor_free_online_adobe.pdf
    • https://cdn.shopify.com/s/files/1/0430/7261/8657/files/5993887181.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/vocabulary_list_for_bank_po_exam.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_off000074df.bin
917838ff799ebe69c7a77c00c15195fcf9464c49a84bd7072962d416eb7f65d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74DF 5100 bytes
font_01_sfnt_off0000862d.bin
0002efcd996e223abd23c842a9f0eac03955b1994d133cec993fd809c31a3201		 pdf-font-stream PDF embedded font (sfnt) at offset 0x862D 10508 bytes

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