Malicious PDF — malware analysis report

Static analysis result for SHA-256 82bf895b5be8e73b…

MALICIOUS

PDF

40.2 KB Created: 2020-08-15 13:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1540b46fe519e8a5a4a059951415b61a SHA-1: 86259ff378a2de551fcb0c96e4ad721db82f2996 SHA-256: 82bf895b5be8e73b7a76161549a002fabc2a195d9fc7e088958a75a20f07deff
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The document body, though partially corrupted, contains text and URLs that align with a lure to redirect users. The ML classifier strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further 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/wb?keyword=gestione%20manuale%20in%20english
    • http://xaxawowon.406techgal.net/uploads/1/3/1/4/131408970/b678391a6c.pdf
    • http://files.econalabama.org/uploads/1/3/1/3/131381363/8309763.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/bovuvovisezabe.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/xogumodomibeperasafu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuvitew.pdf
    • https://cdn.shopify.com/s/files/1/0435/1744/4264/files/how_to_use_pi_in_python.pdf
    • https://cdn.shopify.com/s/files/1/0428/7207/8499/files/fojado.pdf
    • https://cdn.shopify.com/s/files/1/0428/3134/7868/files/3d_to_stl_converter.pdf
    • https://cdn.shopify.com/s/files/1/0435/2219/5608/files/44644454289.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/administrative_procedures_act.pdf
    • https://cdn.shopify.com/s/files/1/0433/8447/1719/files/unearthed_arcana_mystic.pdf
    • https://cdn.shopify.com/s/files/1/0437/1854/1480/files/passive_all_tenses_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0437/0300/9430/files/pakeluwurewanojarafidikep.pdf
    • https://cdn.shopify.com/s/files/1/0434/5423/4785/files/kudufetijelubezukasup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82127534182.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_off00005e56.bin
f52827529260ead06cbaba04ed3d7b0d3dcfae22a74fb73e015f6b5bb5f8fe2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E56 5036 bytes
font_01_sfnt_off00006f4f.bin
524709aa5f38dc0be5cd16a9cbd085510c97cf719c95a047e71640cc629063cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4F 10192 bytes