Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3b4f51639de882…

MALICIOUS

PDF

36.7 KB Created: 2020-08-21 07:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b49caa50ef78ab85576d437554b9f53b SHA-1: 2357a522f3cd1035a6b6ea2e050d71099b6e8d7d SHA-256: ab3b4f51639de882754a4fa65b456dee95e176ce241a8b8c808cfc1b5bb6ef28
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is https://ttraff.cc/pify?keyword=english+test+b2+pdf+with+answers, which is likely used to lure users to malicious content. The document body, though heavily obfuscated, contains references to the redirector URL and other embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=english+test+b2+pdf+with+answers
    • http://fotofe.servdmelbourne.com/uploads/1/3/0/7/130776760/luwavutera.pdf
    • http://wewuxevij.mastech-engineering.com/uploads/1/3/0/7/130739163/sorasixukipudazam.pdf
    • http://files.ronnieaaronson.com/uploads/1/3/0/8/130814055/ferejotebuser_kibeg_nowuxujovojawum_zapejutejo.pdf
    • http://files.ottawarotarycalendar.com/uploads/1/3/0/8/130874582/wiwisugi_jolepasuxexojiv.pdf
    • http://nukoxu.violetconner.com/uploads/1/3/0/7/130739204/kulefanolekuzavaziwu.pdf
    • https://cdn.shopify.com/s/files/1/0427/5562/1031/files/hotspot_mikrotik_login_pages_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/5329/2440/files/dialogue_worksheets_for_middle_school.pdf
    • https://cdn.shopify.com/s/files/1/0428/1516/0487/files/33357205753.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/guide_taille_bonnet_bb_kiabi.pdf
    • https://cdn.shopify.com/s/files/1/0441/1323/2024/files/tazomipukasesav.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/minecraft_pe_servers_0._12._3.pdf
    • https://cdn.shopify.com/s/files/1/0435/2465/3224/files/darifuterivizurupotijilu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9047/files/duxuniwegodusag.pdf
    • https://cdn.shopify.com/s/files/1/0430/7134/0698/files/google_map_api_key_android_studio.pdf
    • https://cdn.shopify.com/s/files/1/0435/4162/7029/files/o_caldeiro_azul_marcelo_gleiser.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9488/files/34092063832.pdf
    • https://cdn.shopify.com/s/files/1/0433/2643/9582/files/lubipefokezerig.pdf
    • https://cdn.shopify.com/s/files/1/0438/3028/0352/files/catur_marga.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_off0000503b.bin
5074ac9de45ea5c1b12cc861034809491b3a4bf229361a89be6f2d9de868756d
pdf-font-stream PDF embedded font (sfnt) at offset 0x503B 5624 bytes
font_01_sfnt_off00006362.bin
e00a14b650a24045c74f4416d4b2c975c3a3e9d3c644b3db805dbbe9e7a53119
pdf-font-stream PDF embedded font (sfnt) at offset 0x6362 10296 bytes