Malicious PDF — malware analysis report

Static analysis result for SHA-256 185aa059a04aa836…

MALICIOUS

PDF

45.8 KB Created: 2020-08-21 05:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48273dc6f95123b373e2a406850bad5a SHA-1: 44a770502b19df79c50be3223f2a0774ef720b1d SHA-256: 185aa059a04aa836db80efacc7c7db84c2f3b6c93773d778773aef8cbdc40a84
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to a malicious URL, likely as part of a phishing or scam campaign. The document body mentions 'Viber backup from pc to android', suggesting a lure to trick users into clicking the malicious link. The presence of numerous external PDF links, many pointing to Shopify, indicates a potential link farm or SEO manipulation tactic to distribute the malicious content.

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=viber+backup+from+pc+to+android
    • http://files.exploringoverload.com/uploads/1/3/0/7/130775398/2166324.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/2513/6797/files/structure_and_function_of_aquatic_ecosystem.pdf
    • https://cdn.shopify.com/s/files/1/0430/9365/5716/files/bilite.pdf
    • https://cdn.shopify.com/s/files/1/0432/0601/7185/files/21064956029.pdf
    • https://cdn.shopify.com/s/files/1/0431/6971/0242/files/vanorevu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/mabadidixajobuxar.pdf
    • https://cdn.shopify.com/s/files/1/0433/9338/4599/files/24797977004.pdf
    • https://cdn.shopify.com/s/files/1/0434/6380/3040/files/daily_student_attendance_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8359/files/giancoli_physics_6th_edition_solutions_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/1983/7346/files/wojirij.pdf
    • https://cdn.shopify.com/s/files/1/0430/9912/7959/files/luvezodilolo.pdf
    • https://cdn.shopify.com/s/files/1/0459/9139/5485/files/beyblade_metal_fusion_games_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0447/9765/7248/files/6th_grade_saxon_math_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/witch_pistol_gungeon.pdf
    • https://cdn.shopify.com/s/files/1/0448/2659/1389/files/64721131043.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006825.bin
42a6c0930e4121523ad3274daaa884af431054a3f4be52a658a53085c670f7e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6825 5144 bytes
font_01_sfnt_off00007985.bin
73c2f7fa764b885ea77f4104630b31a5bd8bc90ed5599051a9a1a6b075a18264		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7985 9996 bytes
font_02_sfnt_off00009bd3.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BD3 4324 bytes

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