Malicious PDF — malware analysis report

Static analysis result for SHA-256 4527a0edc5a12347…

MALICIOUS

PDF

35.5 KB Created: 2020-08-27 17:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd157dea9067f386df244801677e884f SHA-1: 4ab57973203c35e86207c6a35e832669d3239fc9 SHA-256: 4527a0edc5a123479b507bf22bccd5430c93b47287f8eb1eb47a50223ab7d453
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, indicating a phishing or scam attempt. The document body, though heavily corrupted, contains text related to 'free download' and the malicious URL. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly suggest this is a lure to a malicious site. No scripts were extracted from this sample.

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=textbook+of+nursing+education+free+download
    • http://wizup.soulsearchrecords.com/uploads/1/3/2/7/132712354/xijidib.pdf
    • https://cdn.shopify.com/s/files/1/0446/3312/9123/files/benedetti_poemas_de_amor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pejolezogumulugadajo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/nozeliremowafilawar.pdf
    • https://cdn.shopify.com/s/files/1/0434/9070/5574/files/donuxifoviluxevisagisasa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9155/8551/files/kafudodaboputasivewesab.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/benzimidazoles_synthesis.pdf
    • https://cdn.shopify.com/s/files/1/0437/7539/3944/files/acting_tips_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/dekakidirelumanubof.pdf
    • https://cdn.shopify.com/s/files/1/0429/9676/0730/files/50786178581.pdf
    • https://cdn.shopify.com/s/files/1/0430/6285/3794/files/kafudubugaduxe.pdf
    • https://cdn.shopify.com/s/files/1/0440/3822/6085/files/snoop_dogg_doggystyle_songs.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_off00004bd9.bin
aad38e245f077fcdad02cb11926a429cb1d01fe5915764ac703b009c401e833e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4BD9 5504 bytes
font_01_sfnt_off00005eb4.bin
bca6ba6b2ad7e1bd4790faeb7acf2515935a7c11c285045831247f4d9aacb6f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB4 10096 bytes