Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b5e1720e7a56cf…

MALICIOUS

PDF

51.6 KB Created: 2020-08-08 23:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf27b8e996d5dfdc267d3076b26d53d6 SHA-1: ed814985fb4bc37e5126980c951abffcd5c9e559 SHA-256: 92b5e1720e7a56cf2e3e299951935d744ed19efe2d4f06ea211c67367606b9a5
152 Risk Score

Malware Insights

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

The PDF document contains a link farm and a direct link to a known malicious redirector, https://ttraff.cc/wb?keyword=grammy%202019%20nominations%20pdf. This suggests the document is designed to lure users to malicious infrastructure, likely for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

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.cc/wb?keyword=grammy%202019%20nominations%20pdf
    • http://files.erikahanneson.com/uploads/1/3/2/8/132816036/resiwade_tasokukum_pobijoseluzuza.pdf
    • http://files.petervschaeffer.com/uploads/1/3/1/1/131164097/towerabudevuk_wakolu_logumalonug.pdf
    • http://files.bookfabulous.com/uploads/1/3/1/0/131070754/87d6f09e7.pdf
    • http://files.cicaclaim.com/uploads/1/3/0/8/130874544/golokoga.pdf
    • https://cdn.shopify.com/s/files/1/0451/6134/9269/files/ielts_speaking_task_2_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/2760/3354/files/allahabad_high_court_aro_marks.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sobobubujuwin.pdf
    • https://cdn.shopify.com/s/files/1/0437/5809/2439/files/bejavutobefezifosegi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7355/2040/files/83050476393.pdf
    • https://cdn.shopify.com/s/files/1/0432/5956/0086/files/kojufajekafiwekaduzaxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2420/3424/files/numalazemojujo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/78199960654.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3494/files/nupeloxetazuxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1641/files/54799079792.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/mezepali.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/tariporokulevomutibot.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xedatojif.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000673e.bin
e1077903e7a42824faf5600bebe0884bcdf2422e7bcecab775c103b1bd7ad3a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x673E 5772 bytes
font_01_sfnt_off00007ad2.bin
dae0f12506c17deaa818396cb86411da2f7a72f10e575d6fda98e021880a3e82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD2 2744 bytes
font_02_sfnt_off0000867d.bin
639a87f0677943ffc2708532bea9ed8bbdd0d2a4b9263a93404f465fd5cccab8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x867D 10868 bytes
font_03_sfnt_off0000abc0.bin
bcfecb9fde4b74e4a2b692e15caf305b2988a1cfe4c6386614002e38d35feb86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABC0 16168 bytes

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