Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78a5c9ca8b4b5eb…

MALICIOUS

PDF

33.4 KB Created: 2020-08-07 21:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27b605f8a0c59f0dfc2bd15220eeefa9 SHA-1: e6fab0303b0f2c990f4cf26f4ca531670d3a042f SHA-256: d78a5c9ca8b4b5ebbdaefdf0ba43ff2b8bc14c7fe9d804adb3061aa6a7cd8844
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, disguised as a download for the South African national anthem. This is further supported by heuristics indicating a malicious redirector link and a link farm. The document body, though heavily obfuscated, contains the target URL and references to PDF downloads, reinforcing the social engineering lure. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=south+african+national+anthem+download+pdf
    • http://files.streetfashion-magzzine.com/uploads/1/3/1/6/131606487/6068161.pdf
    • http://mogaz.jackdogproductions.com/uploads/1/3/1/4/131482976/doduwexegare.pdf
    • http://files.catholiccharitiesbhm.org/uploads/1/3/1/4/131453022/rifaz.pdf
    • http://files.houstonaffordabledesigns.com/uploads/1/3/1/4/131406473/kejibogepita.pdf
    • http://files.oma-cob.org/uploads/1/3/0/7/130739601/c2ca220e52.pdf
    • https://cdn.shopify.com/s/files/1/0432/0195/3952/files/95597664403.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/74144549876.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7345/files/29345885776.pdf
    • https://cdn.shopify.com/s/files/1/0429/3728/6812/files/knights_of_pen_and_paper_2_crafting.pdf
    • https://cdn.shopify.com/s/files/1/0437/6795/5610/files/lista_de_balanceamento_de_equaes_quimicas.pdf
    • https://cdn.shopify.com/s/files/1/0434/5135/1207/files/lavipopixovifonudob.pdf
    • https://cdn.shopify.com/s/files/1/0429/3437/0470/files/33352079142.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5813/files/93945015396.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6968/files/lowojejejemetekigojid.pdf
    • https://cdn.shopify.com/s/files/1/0432/9242/6405/files/89079337334.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_off0000442c.bin
4147849dedb7ad7999622b976760597c310130ca30971e9ea65c0737753a5e15
pdf-font-stream PDF embedded font (sfnt) at offset 0x442C 5412 bytes
font_01_sfnt_off00005683.bin
b6124819cc4272ab18f57f213cdf83399ba86de68296f1a94e3a7fc2bb9acf44
pdf-font-stream PDF embedded font (sfnt) at offset 0x5683 10080 bytes