Malicious PDF — malware analysis report

Static analysis result for SHA-256 950a299769bd77af…

MALICIOUS

PDF

43.0 KB Created: 2020-09-01 06:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 333ac801566510dd92991f25e8ab3fc7 SHA-1: 66cafb121055d2fe32d8f975920865dbab8d1b01 SHA-256: 950a299769bd77afe2dcd100bd3ce6a942c25ade951a1182ed36adef70e6f70d
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, disguised as song lyrics. This is further supported by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF also hosts a large number of external links, suggesting a link farm for SEO manipulation or to distribute malicious content. The ML classifier 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.ru/wix?keyword=bob+marley+songs+lyrics+pdf
    • https://cdn.shopify.com/s/files/1/0444/4746/5639/files/percussion_ensemble_christmas_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0743/files/vavojubasawanasipivovug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/telisupuf.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/9238198408.pdf
    • https://cdn.shopify.com/s/files/1/0437/7313/2954/files/8813253339.pdf
    • https://cdn.shopify.com/s/files/1/0433/7998/2492/files/lelomorituvalavolazuza.pdf
    • https://cdn.shopify.com/s/files/1/0445/8224/0420/files/bodyweight_exercises_chart.pdf
    • https://cdn.shopify.com/s/files/1/0430/9729/2967/files/acceleration_calculation_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0441/9478/files/blues_chords_progression_piano.pdf
    • https://cdn.shopify.com/s/files/1/0429/1146/5638/files/63521248085.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69440205977.pdf
    • https://cdn.shopify.com/s/files/1/0427/5725/9420/files/standard_aluminum_sheet_metal_thicknesses.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5870/files/browband_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/4152/9754/files/janela_magica_cecilia_meireles.pdf
    • https://cdn.shopify.com/s/files/1/0438/3028/0352/files/motor_evoked_potential.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_off0000616b.bin
986fee2aa6b830e6e7a24c12ba9ac641771d526d66235ffbf2ee85d90fc33928
pdf-font-stream PDF embedded font (sfnt) at offset 0x616B 5768 bytes
font_01_sfnt_off00007500.bin
e6905f7091336e7a7b467434c82ba36cc0bca12692e9232eb3cfdef600628506
pdf-font-stream PDF embedded font (sfnt) at offset 0x7500 13144 bytes