Malicious PDF — malware analysis report

Static analysis result for SHA-256 99efe0c2d597977d…

MALICIOUS

PDF

49.1 KB Created: 2020-08-09 14:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f0ae2f4f7af904c05fcb7c0249a3ae1 SHA-1: 0ab307676d3afaa1a375532d85b7787c512efded SHA-256: 99efe0c2d597977da26f4018e94e3e93857b17f27602c63025826ab1fadd219b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for "graphic design portfolio examples pdf". The primary malicious link identified is https://ttraff.cc/pify?keyword=graphic+design+portfolio+examples+pdf, which is likely used to redirect the user to a further malicious destination. The ML classifier also strongly indicated maliciousness.

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=graphic+design+portfolio+examples+pdf
    • http://renupo.voicesforearthjustice.org/uploads/1/3/1/6/131637814/ravujupaduzatifenudu.pdf
    • http://files.srgchi.org/uploads/1/3/1/3/131379951/zitejumewibopux_bajugetelor_dobiwezo_golubimuruz.pdf
    • http://jufotu.fuzzfaced.net/uploads/1/3/1/6/131606490/f26578fb.pdf
    • http://lozuj.imarkv.com/uploads/1/3/1/0/131070420/3881ca626.pdf
    • http://lozuj.imarkv.com/uploads/1/3/1/0/131070420/3881ca
    • https://cdn.shopify.com/s/files/1/0434/7995/7669/files/lizizuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/6380/4058/files/22220967295.pdf
    • https://cdn.shopify.com/s/files/1/0436/4160/2208/files/46658924541.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7187/files/james_rollins_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0429/0409/2839/files/acuerdo_climatico_de_paris.pdf
    • https://cdn.shopify.com/s/files/1/0438/9958/4664/files/moxulodiva.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/95957330819.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/zivuregejasudadijozolaxep.pdf
    • https://cdn.shopify.com/s/files/1/0438/7205/9547/files/kipajobu.pdf
    • https://cdn.shopify.com/s/files/1/0440/5261/1222/files/85179043234.pdf
    • https://cdn.shopify.com/s/files/1/0435/6151/7217/files/pipunumabefizofaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/7656/6684/files/husky_air_scout.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_off0000805d.bin
86fb4c0e54472b878882eded8e9609b01d66563b35a226d14331c86d73d9c056		 pdf-font-stream PDF embedded font (sfnt) at offset 0x805D 5668 bytes
font_01_sfnt_off00009388.bin
851b4fd1977956a9da91567b7e9dd5cde323b78b6666496b442b11e2aba615e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9388 10392 bytes

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