Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b7e3d3397a9e6d…

MALICIOUS

PDF

42.9 KB Created: 2020-09-18 12:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdf202926faadde8a474e29ca9a0517b SHA-1: c1f70f5cf464961df9c31be0e75e3b49660c538e SHA-256: b3b7e3d3397a9e6d584a8814aeba862bc03053871cb50307ca96a324d8e11672
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that is disguised as a study guide preparation resource. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, suggesting the primary intent is to redirect the user to a potentially harmful site.

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.club/wix?keyword=comprehensive+respiratory+therapy+exam+preparation+guide+3rd+edition+pdf
    • http://nabom.autisminthewild.com/uploads/1/3/0/9/130969904/83e35b08e9.pdf
    • http://files.ambcircleoffriends.com/uploads/1/3/1/6/131606396/wojulixomu_jovizanarizi_riladujuza.pdf
    • http://files.creekdontriseband.com/uploads/1/3/1/4/131409200/gomozewop.pdf
    • http://sajulo.trlegacypartnership.org/uploads/1/3/1/4/131437987/0d5b19c157.pdf
    • http://files.mdcsmith.com/uploads/1/3/1/4/131406352/17cf3c23a.pdf
    • https://cdn.shopify.com/s/files/1/0429/1556/1638/files/91989569385.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13578549785.pdf
    • https://cdn.shopify.com/s/files/1/0465/5008/9878/files/zutenimemuvefebonomege.pdf
    • https://cdn.shopify.com/s/files/1/0433/5029/4687/files/windows_defender_wont_turn_off_real_time_protection.pdf
    • https://5bd10c3e-34ad-4b4e-878f-546a999a2273.filesusr.com/ugd/35c6e2_b7b69ffcc8a94119a2c5babc8e19660e.pdf?index=true
    • https://c8124c39-6af2-4224-aa4f-87e6aa28a6c9.filesusr.com/ugd/41f880_3c7351857a6a47388c06246de1682923.pdf?index=true
    • https://88bbc9c8-97e9-4e08-a442-11b87884a4f6.filesusr.com/ugd/3ed902_7347acb559de486e88c0ba91e00d895d.pdf?index=true
    • https://55d101a5-bafc-45dc-be21-834fa36ac9cd.filesusr.com/ugd/430cb2_81daf314d36643b2bc3e7e017e2452d7.pdf?index=true
    • https://35ba0f43-aef1-4363-b9e0-3865f1707acc.filesusr.com/ugd/17ce20_725bbb68badc45dda4fa7ce2524c8a0d.pdf?index=true
    • https://99623345-4880-4b48-8ee4-851bdc0910fb.filesusr.com/ugd/dba42a_459f54d1e78c42f492e32b671ed57805.pdf?index=true
    • 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_off00005945.bin
645f94f2fddae881fa6ce25eb856eff8d911e4745efaaeb38fd4c934fb7b47b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5945 5724 bytes
font_01_sfnt_off00006cae.bin
2f24dc556d27672a7130b85ba441e09e2fe1cc6448ca0e24953a68a8ac879cbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAE 10332 bytes
font_02_sfnt_off00008fd1.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FD1 4324 bytes

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