Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d42f4fa8ba7e85b…

MALICIOUS

PDF

46.7 KB Created: 2020-08-17 15:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 505e57dbfa8dcf83a061e218d4f165d2 SHA-1: f85e5e014df016e9908a382961bcd0aaa457f1ab SHA-256: 5d42f4fa8ba7e85bb3e75966c25c5c36dadcd513188de88e30364fa37c65a0e5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains references to URLs that are likely part of a link farm or SEO spam campaign. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous links suggests an attempt to direct users to malicious sites.

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=civic+education+curriculum+in+nigeria+pdf
    • http://files.lifebuilderstc.com/uploads/1/3/0/7/130776656/920650.pdf
    • http://mazunew.ghostentertainmentct.com/uploads/1/3/2/7/132740564/bujipisevof_sopusa_jabilo_vuronaruvat.pdf
    • http://files.playsport-usa.com/uploads/1/3/0/8/130814397/piruvitewomilis.pdf
    • http://files.lightonthedesert.org/uploads/1/3/1/3/131379844/tarerogal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26225030347.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/bepoferexumojodunobod.pdf
    • https://cdn.shopify.com/s/files/1/0432/1034/2563/files/tratamiento_de_aneurisma_de_aorta_abdominal.pdf
    • https://cdn.shopify.com/s/files/1/0433/0828/6105/files/descargar_astro_file_manager_pro_apk_full.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5271/files/tujako.pdf
    • https://cdn.shopify.com/s/files/1/0437/5976/3617/files/flash_animation_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/7755/7660/files/51378932123.pdf
    • https://cdn.shopify.com/s/files/1/0428/3485/4051/files/71448290717.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7897/files/bharat_acharya_microprocessor_8085.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a3c.bin
5c62d2eccd7ec59ca9085609e53f8c46685efed2a402d91659f95a0294033e4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3C 5260 bytes
font_01_sfnt_off00008c07.bin
34591f3617ceb88f5ac58bb3e7c464101a14e07f698774a6ee8c1e8ccad0f837
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C07 9916 bytes