Malicious PDF — malware analysis report

Static analysis result for SHA-256 e811bf219a9459d7…

MALICIOUS

PDF

33.0 KB Created: 2020-08-21 20:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 253035cc29b14339b5db565c5f7efd13 SHA-1: 403458a3388c7fa1cd89a788837fa0346d2eef3f SHA-256: e811bf219a9459d7dd43ab11182316cccbf4d5bd2980059e15f74fb1d7e30590
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains text related to a movie title and also includes the malicious URL. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to malicious infrastructure via embedded links.

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/pify?keyword=chalte+chalte+movie+hd+video+song
    • http://surogamig.joycecollinscoaching.com/uploads/1/3/0/8/130874278/demunidufisu_nawasimifekev_lumodomivi_zovivagojetesam.pdf
    • http://files.alliesinhope.org/uploads/1/3/0/7/130738790/sitofoki-jodojok-jokos.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/array_of_colours.pdf
    • https://cdn.shopify.com/s/files/1/0439/4047/9131/files/kebutuhan_dasar_manusia_adalah_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0433/4111/9653/files/60291448331.pdf
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/pdf_file_opener_free_download_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0434/0042/9731/files/81345694108.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/33212231541.pdf
    • https://cdn.shopify.com/s/files/1/0429/4092/4063/files/17829209026.pdf
    • https://cdn.shopify.com/s/files/1/0432/1162/0509/files/osrs_fishing_guide_members.pdf
    • https://cdn.shopify.com/s/files/1/0435/5381/6728/files/80807236509.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5682/files/andaman_map.pdf
    • https://cdn.shopify.com/s/files/1/0434/6249/2325/files/big_ideas_math_algebra_1_a_bridge_to_success.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4629/files/94419736461.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_off0000444d.bin
8e01bfaa32da98376236b98ed2c0daf8fb2b0b0246da066bda719a27a505370c
pdf-font-stream PDF embedded font (sfnt) at offset 0x444D 5224 bytes
font_01_sfnt_off000055f9.bin
d50783d36432097c0fee66b21b551fc0e70d7a20d453b00a2f31c7430458520e
pdf-font-stream PDF embedded font (sfnt) at offset 0x55F9 9768 bytes