Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c230a56877b2661…

MALICIOUS

PDF

47.2 KB Created: 2020-08-26 02:38:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd641bebe4d7919c9fb6fb784787a888 SHA-1: 4262b06f8775e2d47fd308012229f76c984581f8 SHA-256: 8c230a56877b26618f3d6479add97e2ad1aac44948ce490b171c4c385ecd750b
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including a critical link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=gnu+gcc+compiler+code+blocks'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect the user to malicious infrastructure. 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=gnu+gcc+compiler+code+blocks
    • http://files.diamondpta.com/uploads/1/3/0/7/130739986/657d5ade9983.pdf
    • http://temosi.summerridgesammamish.com/uploads/1/3/1/4/131408024/kozajuxuleber-reregodesuto.pdf
    • http://files.drivershieldasia.com/uploads/1/3/1/3/131379540/lagusila-nebuzesodono-masinituguw.pdf
    • http://files.meiraacademy.org/uploads/1/3/2/7/132740343/fivarutabosunitamas.pdf
    • http://gurugix.itsmydayspecialevents.net/uploads/1/3/0/7/130776603/kupif.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/13483261188.pdf
    • https://cdn.shopify.com/s/files/1/0432/1456/9632/files/87095852309.pdf
    • https://cdn.shopify.com/s/files/1/0429/5517/8150/files/xilopoxuxufe.pdf
    • https://cdn.shopify.com/s/files/1/0437/9751/2354/files/concrete_batching_plant_operation.pdf
    • https://cdn.shopify.com/s/files/1/0432/7034/0772/files/dadevajinopidaboza.pdf
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/traduction_anglais_franais.pdf
    • https://cdn.shopify.com/s/files/1/0429/5278/6074/files/wirobewobifed.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/zunezexavebokegiwe.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8310/files/life_and_death_twilight_reimagined_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/4718/8640/files/99864938159.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_off0000730c.bin
426f2135de01f548fd91391fe3e6629d59b94929eece3871210e905d9b6aff9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x730C 5420 bytes
font_01_sfnt_off0000855f.bin
5e256eb76ec514d66e0a4998f7ce51adb025a96d1c315add2e3f4aa65b95bf3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x855F 13108 bytes