Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f76971de149915e…

MALICIOUS

PDF

51.2 KB Created: 2020-08-28 12:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 238b5dadea570f8d2e487ca6e6a3abaa SHA-1: 3425ec5d62d22f150e42ddff61b84149f405ad62 SHA-256: 4f76971de149915e53302a86b761dcbed60bc7c897d71e2e2242c26f2ea5b295
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Tarkov skier quest' and a URL that aligns with the malicious redirector heuristic. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt to drive traffic to malicious 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.ru/pify?keyword=tarkov+skier+quest
    • http://negab.admgems.com/uploads/1/3/2/6/132681352/gogatefezaf-dobamami-nisivasi-nekasokijoku.pdf
    • https://cdn.shopify.com/s/files/1/0434/6186/9733/files/voronezozogezivil.pdf
    • https://cdn.shopify.com/s/files/1/0437/6107/4337/files/android_app_store_developer_login.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/46427435322.pdf
    • https://cdn.shopify.com/s/files/1/0454/7280/9126/files/shankar_bhagwan_ke_bhakti_gana.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2119/files/cell_structure_and_function_quiz_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/9105/7058/files/wordly_wise_3000_book_7_lesson_4_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0432/7528/8742/files/hey_dj_cnco_hd_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0437/8948/4190/files/50882155487.pdf
    • https://cdn.shopify.com/s/files/1/0434/4302/8120/files/85319173259.pdf
    • https://cdn.shopify.com/s/files/1/0435/8340/6239/files/xomunibez.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_off000081f6.bin
8fa83d16bd710e83efc08f478155968e81c9fb2415cbd84104c3240c1e3b9b14
pdf-font-stream PDF embedded font (sfnt) at offset 0x81F6 4848 bytes
font_01_sfnt_off00009294.bin
d23dea4af361d92bbe3d8e584f3072d857c309c7ddb1f3496f0f39ba1aa09ce9
pdf-font-stream PDF embedded font (sfnt) at offset 0x9294 14856 bytes