Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5b0e97fada2ee0…

MALICIOUS

PDF

56.8 KB Created: 2020-08-16 22:40:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da7564ddd8614cc0e05cd026421f7f86 SHA-1: 3e2d15f5fe8bb40c032437207575cf3ada8082ec SHA-256: 3e5b0e97fada2ee07c754bd3fa797a4f85b54e26e754cfa627e76f3822ad6e42
152 Risk Score

Malware Insights

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

This PDF document contains a mass external PDF link farm, with many links pointing to Shopify domains and one critical link to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains the URL "https://ttraff.com/pify?keyword=korean+language+guide+pdf", suggesting a lure to disguise malicious redirection. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting the user to malicious infrastructure via embedded 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.com/pify?keyword=korean+language+guide+pdf
    • http://files.christhamilton.org/uploads/1/3/2/7/132710627/699823.pdf
    • http://wunom.stephenwyrczynski.com/uploads/1/3/0/7/130776262/c66ff120e6.pdf
    • http://sozazovaw.paulreecephotography.com/uploads/1/3/2/7/132710621/5495135.pdf
    • http://files.collageofwomenartists.com/uploads/1/3/1/8/131871586/zorivom.pdf
    • http://files.valialoutrianaki.com/uploads/1/3/1/4/131482832/vozul_liripegapol_mogifamepuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/8450/3453/files/mst3k_space_mutiny.pdf
    • https://cdn.shopify.com/s/files/1/0433/2113/1161/files/cancer_gastrico_dieta.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7087/files/lumbar_back_stretches.pdf
    • https://cdn.shopify.com/s/files/1/0432/4130/8320/files/fallout_4_vr_dlc.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xamunodobesezuwenetubaf.pdf
    • https://cdn.shopify.com/s/files/1/0438/6222/9157/files/pdf_advertising_and_sales_promotion.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pagujusevidunevaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nazowexoratusitufunu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9861/9557/files/multiplication_worksheets_2nd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3028/files/7308231631.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5965/files/costing_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0431/6351/7092/files/calculus_and_analytic_geometry_12th_edition.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_off00008b76.bin
5bbb85e5a48d134fdfb7432ed8b5bec08dca0e560b661807e6bd646edb311b25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B76 6544 bytes
font_01_sfnt_off0000a19c.bin
4b13ae7426e7c67d0861f11234c464df14910af8ae79a72e86e97b03ddb0e778		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA19C 5000 bytes
font_02_sfnt_off0000b2b2.bin
1af475776c8dd798d8875728bfef98db885fb8f4931756a3e0130e7ea4697be7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B2 10316 bytes

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