Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7212b7f4db4b5b…

MALICIOUS

PDF

61.1 KB Created: 2020-08-07 07:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be31030b09c52a86a372e116e4baf12b SHA-1: f100c49eb61abaeb9299f2092abf3e38cb35b9b6 SHA-256: 3b7212b7f4db4b5b98b2c58b272e2b553d559bb9a91864e7f8f719f53e8b22cf
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically targeting the URL https://ttraff.ru/pify?keyword=l+or+blaise+cendrars+pdf+gratuit. This is further supported by ML classification and critical heuristic firings indicating malicious redirector links and a link farm. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the lure for free PDF downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=l+or+blaise+cendrars+pdf+gratuit
    • http://files.rogercoss.com/uploads/1/3/1/3/131379594/gaborozol.pdf
    • http://files.crystalclearcommunications.co.uk/uploads/1/3/1/4/131406286/9906663.pdf
    • http://files.204armycadets.com/uploads/1/3/2/6/132682039/96e336a1184c.pdf
    • http://dumumike.honanhomespun.com/uploads/1/3/1/4/131453574/9871901.pdf
    • https://cdn.shopify.com/s/files/1/0429/6281/3084/files/jalifazozetoramo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7813/9556/files/dolik.pdf
    • https://cdn.shopify.com/s/files/1/0435/8832/1435/files/remifubufuwiwimuguduzon.pdf
    • https://cdn.shopify.com/s/files/1/0427/6230/5702/files/33928470564.pdf
    • https://cdn.shopify.com/s/files/1/0427/4854/3142/files/nesifojitaxufapagisum.pdf
    • https://cdn.shopify.com/s/files/1/0431/1344/7584/files/47370854021.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6648/files/tuporebobutivema.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8656/files/webigifawali.pdf
    • https://cdn.shopify.com/s/files/1/0430/4951/7205/files/25087579364.pdf
    • https://cdn.shopify.com/s/files/1/0439/7016/6942/files/gifozitedoziforamazisujej.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6048/files/fupixejuvunij.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6556/files/python_datetime_to_string.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2103/files/41642765099.pdf
    • https://cdn.shopify.com/s/files/1/0438/1641/9488/files/apologetica_catolica_purgatorio.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009c4c.bin
5dfd135d153bd3d525cb97913ee148e5021a35f1ec0004056c16346b488d8b5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C4C 5404 bytes
font_01_sfnt_off0000aeb7.bin
b1a7cfc460969cd85c4dc0f87c84d179180a9d4c7c47fe743e2214b5615da983
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB7 10416 bytes
font_02_sfnt_off0000d25d.bin
d8a1a34de14a7b8fce5e51635835121d353d188f9ac9ce1e11538509fd4c5cdc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD25D 16060 bytes