Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5aaca98a4718fb…

MALICIOUS

PDF

40.4 KB Created: 2020-08-05 13:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e61714b5a7b4d72da49a0596cc244bb SHA-1: c6309b3addf805d3f9e82dda0ecf445136005b00 SHA-256: dc5aaca98a4718fb0f9f5ee3433259ecf20214433bc7280f448d9f29f73cf10d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The document body, though obfuscated, contains the string 'https://ttraff.ru/pify?keyword=annihilation+pdf+script', indicating a likely attempt to lure users to malicious content. The heuristic firings confirm the presence of malicious redirector links and a link farm, suggesting a phishing or redirection attack.

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=annihilation+pdf+script
    • http://vopeki.physicallyeducated.com/uploads/1/3/1/8/131856772/nutevoriwexip.pdf
    • http://files.akbryanmoulds.co.uk/uploads/1/3/1/6/131637307/lorefadaxemekure.pdf
    • http://files.amandawaltermakeupartist.com/uploads/1/3/0/8/130814411/8008826.pdf
    • http://files.heatherseagraves.com/uploads/1/3/2/3/132302774/nufigidoruz-reverime-mojavo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1645/3272/files/36243184694.pdf
    • https://cdn.shopify.com/s/files/1/0430/1130/9719/files/20422712896.pdf
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/docsify_export.pdf
    • https://cdn.shopify.com/s/files/1/0430/9617/8845/files/speed_test_centurylink.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/annabel_lee.pdf
    • https://cdn.shopify.com/s/files/1/0429/5432/6179/files/renalokavodijazorege.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/30678234919.pdf
    • https://cdn.shopify.com/s/files/1/0435/8524/1256/files/nosuga.pdf
    • https://cdn.shopify.com/s/files/1/0435/1367/5930/files/2__6.pdf
    • https://cdn.shopify.com/s/files/1/0433/3171/5225/files/daliripogima.pdf
    • https://cdn.shopify.com/s/files/1/0440/3612/8933/files/borunaxidim.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_off0000617a.bin
ea96a3204d4c171daa016645f28b33dce632223c22bca9a11f854598464627fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x617A 5232 bytes
font_01_sfnt_off00007344.bin
71de3657142935e881a77dcfa4065a433e881cd425787713911da7340e507d45
pdf-font-stream PDF embedded font (sfnt) at offset 0x7344 9904 bytes