Malicious PDF — malware analysis report

Static analysis result for SHA-256 d697b33ae15b9f35…

MALICIOUS

PDF

54.2 KB Created: 2020-08-14 20:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30c2da43fb86eee658e9c5e6faac34d7 SHA-1: f7538c926d5013b5667a9592dcac714a12334b20 SHA-256: d697b33ae15b9f35446e14d9883e0554345b2fee3740403ab9683df725ddf587
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector hosted on 'ttraff.ru'. This indicates a link farm or redirection attack designed to lead users to malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the presence of numerous links and the redirector URL are strong indicators of a phishing or redirection campaign.

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/wb?keyword=oeko%20tex%20standard%20100%20pdf
    • http://files.hudsonvalleygarlicgrowers.com/uploads/1/3/1/0/131070859/gabugalam-pugobajepir.pdf
    • http://files.constabilephotography.com/uploads/1/3/1/4/131437987/vowew-xanifavewolivit-fesij.pdf
    • http://sofina.pyratellama.com/uploads/1/3/1/0/131070374/xenonalezeburi.pdf
    • http://lekolov.windybushswimclub.com/uploads/1/3/0/7/130776031/dodar-vefuzesuzaneko.pdf
    • https://cdn.shopify.com/s/files/1/0428/5513/7447/files/manuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/4190/5057/files/86008427867.pdf
    • https://cdn.shopify.com/s/files/1/0432/7384/6947/files/21353269114.pdf
    • https://cdn.shopify.com/s/files/1/0429/3401/0015/files/wezawadazajela.pdf
    • https://cdn.shopify.com/s/files/1/0430/2975/8103/files/kulakenipofegutaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1733/files/81272023790.pdf
    • https://cdn.shopify.com/s/files/1/0432/6280/4136/files/36911702113.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vojinanekarab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/vomozaroxelomexab.pdf
    • https://cdn.shopify.com/s/files/1/0430/0079/1191/files/bhagavad_gita_english_download.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_off00009389.bin
011c0b2887ada2a36535c565fa753607e0771e454799fa01fbd50aedb16b242f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9389 5356 bytes
font_01_sfnt_off0000a5d1.bin
65c17cb367c91a2a9511f62794c83af1ad28d3cc876d0634eda73ba7490fbefd
pdf-font-stream PDF embedded font (sfnt) at offset 0xA5D1 10828 bytes