Malicious PDF — malware analysis report

Static analysis result for SHA-256 35de181b7baf709f…

MALICIOUS

PDF

56.4 KB Created: 2020-08-15 12:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a748be9cea9326da26d56baa994ec34 SHA-1: d817d2bafb9229a6b0aec381909bcd29b14d7ca2 SHA-256: 35de181b7baf709f5d6b93effbdc015acc3f3a8ab897e3599f19e6c260ba28f7
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm. One of these links, 'https://ttraff.cc/wb?keyword=radiestesia%20radionica%20pdf', points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The primary goal appears to be SEO manipulation or user redirection through a dense collection of PDF links.

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.cc/wb?keyword=radiestesia%20radionica%20pdf
    • http://files.deloresfossen.com/uploads/1/3/1/4/131438835/vuxiponokitu.pdf
    • http://files.hrpsychologyandcoaching.com/uploads/1/3/1/4/131453215/pusun-kewisuwuv.pdf
    • http://files.animalguardianshorserescue.org/uploads/1/3/1/4/131407067/1214556.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4748/files/76198087445.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovetutokukike.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7665/files/galaziwidugaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/4317/6091/files/argala_stotram_sanskrit.pdf
    • https://cdn.shopify.com/s/files/1/0440/3865/2069/files/kezegoxemizinonizo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6952/1568/files/d_d_5e_free_adventures.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/texirid.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7800/files/nasejiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tadigepulimo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0365/7887/files/meld_for_windows.pdf
    • https://cdn.shopify.com/s/files/1/0436/3422/9406/files/3d_anime_live_wallpaper_android.pdf
    • https://cdn.shopify.com/s/files/1/0429/7211/9199/files/29879077516.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e8f.bin
a3f200f9740cf33483229c0aa158dad493771ca4baaf2fb78673b2e7105e258a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E8F 5124 bytes
font_01_sfnt_off00009005.bin
a511fb262e2f240b0cc62b800179189f1c69c7b4d67d938f9bc0c5e12ef74554		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9005 2024 bytes
font_02_sfnt_off0000999a.bin
569202677c5fcbaed6173c4418decd3f8986a0eba5c32dc31428d41194e18f9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x999A 11372 bytes
font_03_sfnt_off0000beae.bin
9c0b59d593f481c42a0bc6fa35291501d7cce0bda045d1a0c41de16a57cce5b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAE 16344 bytes

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