Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e1d820723fb793…

MALICIOUS

PDF

50.8 KB Created: 2020-08-01 15:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 269968c555a8cb4ea31f2c77e9704b1b SHA-1: 8c00735333eb32e3997820e75f94147710d058e5 SHA-256: 21e1d820723fb793f0d339c95176acfc0a2875600c04bf0ebad964e6530f4fa9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found by heuristics. This suggests the document is designed to redirect users to malicious sites, likely for phishing or malware delivery. The ML classifier strongly supports the malicious verdict.

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=virtual+villagers+4+walkthrough
    • http://files.asiaticofusion.net/uploads/1/3/1/3/131383247/xadisugowapar-ridumofa-foxawake-fujoj.pdf
    • http://files.voetlichtpedicure.nl/uploads/1/3/1/6/131637313/7108803.pdf
    • http://files.caitlinshome.com/uploads/1/3/0/8/130813730/8922494.pdf
    • http://files.greenphilsinc.com/uploads/1/3/1/8/131859261/napoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84113106953.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/nopogenapotelebi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3260/0985/files/sidaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/9386/8187/files/wurukivefimadelunojezugor.pdf
    • https://cdn.shopify.com/s/files/1/0435/4542/8122/files/vowenitasajixitaxanezuwos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dilos.pdf
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/75378732696.pdf
    • https://cdn.shopify.com/s/files/1/0429/6310/8003/files/sitezaliwepukasaniraxeje.pdf
    • https://cdn.shopify.com/s/files/1/0437/2335/8358/files/nowokiguxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/22196559875.pdf
    • https://cdn.shopify.com/s/files/1/0432/0264/2075/files/fotelenawivufagefiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/9054/2753/files/ratoxewubadimovasiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/97556122765.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_off000088bd.bin
1204fe6e6677222a1784d9e5d8e10dab3ef122c253d3feef69e7967e9d92470d
pdf-font-stream PDF embedded font (sfnt) at offset 0x88BD 5216 bytes
font_01_sfnt_off00009a90.bin
13f75201f079f6b8811e8876b48eee0bfbbdb03f3669e92cd0279052c61f5ff8
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A90 10532 bytes