Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9dd82979302dc6…

MALICIOUS

PDF

44.5 KB Created: 2020-08-30 11:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f2a69bf3e353449eff69ff26ac1821c SHA-1: a311e301feec6d9b41aaaec02a7bd9ead547fc95 SHA-256: 8b9dd82979302dc6ab56abcc8cf6e3a8368e2236fceb9bd04245286504981a3d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated but contains the malicious URL.

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/wix?keyword=lydia+farley+nude
    • https://cdn.shopify.com/s/files/1/0431/3877/7249/files/wuvawazibilivopo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0715/6128/files/powerheart_aed_g3_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/8874/7423/files/rheem_heat_pump_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0725/files/nusuwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6548/3172/files/xejofezowom.pdf
    • https://cdn.shopify.com/s/files/1/0435/0682/7428/files/canl_c4_b1_tv_izle.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wizivudid.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/bringing_up_bebe_pamela_druckerman.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1029/files/cardiopatia_congenita_mas_frecuente_en_mexico.pdf
    • https://static.usrfiles.com/ugd/5bb01c_a8ed7c33a79c45a195c88160459933f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_4fd29c6e5bee4236949c82f40301a320.pdf
    • https://static.usrfiles.com/ugd/87a178_fff617b3da7a4f2da06841fd5f37b05a.pdf
    • https://static.usrfiles.com/ugd/0511f5_0544ff3833f546d681bb8990c069c416.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_off0000640a.bin
b1a4f430d4ad18d9b9c5c9290b97e23230f0f6755721fea33318e3605db66b80
pdf-font-stream PDF embedded font (sfnt) at offset 0x640A 4456 bytes
font_01_sfnt_off0000732b.bin
b41fd882a8d9eb4909a97115bb69653ee283940886fe4366559ea853186e22ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x732B 10620 bytes
font_02_sfnt_off00009731.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9731 4324 bytes