Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c21500cab5f2dd…

MALICIOUS

PDF

95.5 KB Created: 2020-08-02 05:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c75b5cd856e8c86e5ea06c94151306ab SHA-1: a6c54d06c503c2f3b65dbe78aa37a121811f60d2 SHA-256: d9c21500cab5f2ddb3e53b663af7de6908066911c7b2605f3dfe4f693b08da9a
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of this redirector scheme. The presence of a large number of external PDF links further suggests a link farm or SEO poisoning tactic to distribute malicious content.

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=onemanga+com+bleach
    • http://files.borgiott.com/uploads/1/3/1/0/131070918/4469019.pdf
    • http://files.eventandsupply.com/uploads/1/3/1/3/131398177/wokeb_xupukol_xulujajafewori.pdf
    • http://files.elliottforrest.com/uploads/1/3/1/4/131438453/musobinele.pdf
    • https://cdn.shopify.com/s/files/1/0430/4338/9597/files/pujulalom.pdf
    • https://cdn.shopify.com/s/files/1/0429/8119/5927/files/76589386230.pdf
    • https://cdn.shopify.com/s/files/1/0431/9431/9009/files/48046562185.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7362/files/weber_carbs_tuning.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/twt_sirius_name_copy.pdf
    • https://cdn.shopify.com/s/files/1/0434/3303/3877/files/jolumekefakuropibu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4430/6086/files/56573870057.pdf
    • https://cdn.shopify.com/s/files/1/0431/1462/7234/files/wujajutesepagaxun.pdf
    • https://cdn.shopify.com/s/files/1/0434/5616/8093/files/kojerimoduwogedefepe.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4939/files/jijesetijusimuferotepeko.pdf
    • https://cdn.shopify.com/s/files/1/0432/5041/7827/files/mazajotejifotefag.pdf
    • https://cdn.shopify.com/s/files/1/0427/6230/5702/files/2893168947.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e0d.bin
ee3074c187fbf4bbd048f88a79ed4cd5750776f5e077eb4a546f6dea1fbb1618
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0D 3992 bytes
font_01_sfnt_off00013c23.bin
7381f3bf43c730345fafa9bccd263422d4386643ea17d1eb2adc52ea8d7fb39b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C23 5104 bytes
font_02_sfnt_off00014d54.bin
289a768dde197450483d1a99ec9c7139e46f5842abe0ce95db12191c7c3c8887
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D54 10308 bytes