Malicious PDF — malware analysis report

Static analysis result for SHA-256 873727a0ab55bea9…

MALICIOUS

PDF

47.1 KB Created: 2020-09-09 00:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 315677e4fbdd3f6cecb96550c644b8ab SHA-1: e93e1b3d984b22b56d757a19e3db147477d2e13a SHA-256: 873727a0ab55bea99d699468f34b7019c005439f9657e50dca7d3d77d38c203d
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL found in the heuristics. This suggests the PDF is designed to trick users into visiting a malicious site, likely for further exploitation or credential harvesting.

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.club/wix?keyword=dwarf+hunter+wow+classic+leveling+guide
    • https://cdn.shopify.com/s/files/1/0433/4800/0927/files/cherrypickers_guide_to_rare_die_varieties.pdf
    • https://cdn.shopify.com/s/files/1/0450/2568/9758/files/cat_3208_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/7813/1611/files/sobopuwa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5696/3479/files/orchestra_instruments_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8036/files/9638779524.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/amrish_puri_photo_hd.pdf
    • https://cdn.shopify.com/s/files/1/0428/9983/2995/files/muloregokidisaxesijej.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tedix.pdf
    • https://cdn.shopify.com/s/files/1/0438/5597/0454/files/gebabawotubaro.pdf
    • https://cdn.shopify.com/s/files/1/0437/0920/2597/files/75562256343.pdf
    • https://cdn.shopify.com/s/files/1/0427/9749/8535/files/cdisplayex_comic_reader_premium_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/fsuipc_fsx_blogspot.pdf
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/ansys_aim_19._2.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/ravegimatazos.pdf
    • https://cdn.shopify.com/s/files/1/0440/6929/0149/files/sweater_weather_karaoke.pdf
    • https://cdn.shopify.com/s/files/1/0431/8999/3636/files/samsung_secure_folder_apk_lollipop.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_off00007a52.bin
f86e936a4e45c522c97a8f7fb7f4084e222f4c2331ea45189d7117a6e933b0cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A52 5432 bytes
font_01_sfnt_off00008ce6.bin
a8abe7f35b7fe79d7c0e50fe8671698950ac558b9e7a241f2f2fb5087a4fc665
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE6 10252 bytes