Malicious PDF — malware analysis report

Static analysis result for SHA-256 4373b29a1fc600b7…

MALICIOUS

PDF

48.3 KB Created: 2020-08-21 11:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1371a88bcd7345f6ad214c9e92440bd SHA-1: 8c907fb71a778a85d7e05b7c3a0d3119c6629d20 SHA-256: 4373b29a1fc600b7816a2e25d633b948e7d92fe650f31eadd4f0101bf0d794db
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.ru'. The ML classifier also strongly indicated maliciousness. The document body contains what appears to be obfuscated text and a URL that aligns with the malicious redirector.

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=alvida+alvida+mahe+ramzan+audio
    • http://files.narrowescapear.com/uploads/1/3/1/4/131453896/xivudigawi.pdf
    • http://files.havenartistry.com/uploads/1/3/1/8/131871852/af9914e003e.pdf
    • http://luxipe.beautyandbreakdowns.com/uploads/1/3/1/6/131636655/nukari.pdf
    • http://files.cpsa212-arizona.org/uploads/1/3/2/8/132815882/vogefesojejer.pdf
    • http://xeleke.sailabilitybatemansbay.com/uploads/1/3/2/6/132696067/e3894.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/aviones_militares_espaoles.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2690/files/jipujiferiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/8640/5022/files/mujiz.pdf
    • https://cdn.shopify.com/s/files/1/0440/5015/3622/files/darksiders_warmastered_edition_achievement_guide_and_roadmap.pdf
    • https://cdn.shopify.com/s/files/1/0430/0472/3349/files/larson_algebra_2_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/91650340479.pdf
    • https://cdn.shopify.com/s/files/1/0438/9827/3944/files/azhagendra_sollukku_muruga_tamil_song.pdf
    • https://cdn.shopify.com/s/files/1/0434/6737/4758/files/wekava.pdf
    • https://cdn.shopify.com/s/files/1/0448/4605/5586/files/flowchart_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/2518/7491/files/british_english_phonemic_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/9523/6513/files/canon_eos_30d_software_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0431/5758/6071/files/37701686238.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006904.bin
04b7d07f78d98503a2e26799abb5e98e46aee6487b6602adc11b9277e56f74ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6904 4988 bytes
font_01_sfnt_off000079d6.bin
d1ad1eba0915f7a0dee81ffe27204ca2cade92100d3f53bdb01bb6fbe00fc186		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79D6 13888 bytes
font_02_sfnt_off0000a5b1.bin
a2fcc5e0d7614d2fd0b0dae7ceb6e1627d8508c282b7a3e88e35fd6a897a25b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5B1 3676 bytes

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