Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c23b55f248d514c…

MALICIOUS

PDF

39.4 KB Created: 2020-08-14 01:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 345d7117e916e6ea5c31e0fd651339c6 SHA-1: 942b3979a47b454018f963af1c52527982c87368 SHA-256: 7c23b55f248d514c0f77bc097d9287d0722f34a5101fa8ef1f6bb12f68b6ef60
152 Risk Score

Malware Insights

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

The PDF file contains a mass external link farm, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The primary malicious URL identified is 'https://ttraff.cc/pify?keyword=archero+hack+apk', suggesting a lure related to game hacks. The document body, though heavily obfuscated, contains references to this URL and other PDF links, reinforcing the link farm attack pattern. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a malicious redirection attempt.

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=archero+hack+apk
    • http://files.bakercfoadvisory.com/uploads/1/3/1/3/131384424/7140bb.pdf
    • http://files.waveloopart.com/uploads/1/3/2/7/132740343/883d0.pdf
    • http://files.faumconline.net/uploads/1/3/2/8/132814544/3061338.pdf
    • https://cdn.shopify.com/s/files/1/0432/4104/6171/files/27560730039.pdf
    • https://cdn.shopify.com/s/files/1/0440/2236/6366/files/cell_biology_articles.pdf
    • https://cdn.shopify.com/s/files/1/0449/8512/2984/files/catherine_bell_naked.pdf
    • https://cdn.shopify.com/s/files/1/0440/5038/2998/files/wumitenegeletokedi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3122/2677/files/the_college_panda_s_act_math_advanced_guide_and_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/0488/6166/files/97874952.pdf
    • https://cdn.shopify.com/s/files/1/0429/5717/6986/files/bluetooth_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4615/files/marketing_branding_strategies.pdf
    • https://cdn.shopify.com/s/files/1/0431/0364/9953/files/microsoft_visual_c_2008_redistributable_x64.pdf
    • https://cdn.shopify.com/s/files/1/0430/9948/8423/files/figudufatiramo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0865/files/22549367237.pdf
    • https://cdn.shopify.com/s/files/1/0437/4655/8106/files/73944241510.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_off00005e9a.bin
52996dcd80d75710fb6634f319257a12b77428dcdb05269ba418f4ed260f6252
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9A 4864 bytes
font_01_sfnt_off00006f16.bin
6c7198a3a7f7ea3b8f976e90c76b03daae7f2678490d0cdf7e8a3dc0c67af71c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F16 10024 bytes