Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c26bde1dacf376…

MALICIOUS

PDF

283.8 KB Created: 2020-08-04 11:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4d133df589f46a0cd109fe3345243ba SHA-1: efc685c63d83b11778b6df5beaf8fb9bf151254c SHA-256: b8c26bde1dacf376caee974b01577e8763598b4a5e3f01d38d4ebda75cd02494
94 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link to 'ttraff.ru', identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the same malicious URL. This indicates the primary purpose is to lure the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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=arap+bahar%25C4%25B1+nedenleri+ve+sonu%25C3%25A7lar%25C4%25B1+pdf
    • http://files.aurorasantiago-ortiz.com/uploads/1/3/2/6/132680860/5e358c7cc.pdf
    • http://files.thegeneralmusic.com/uploads/1/3/2/7/132712119/5213996.pdf
    • http://files.natengleague.net/uploads/1/3/2/3/132303060/345d11b.pdf
    • https://cdn.shopify.com/s/files/1/0434/2831/5288/files/ivo_welch_corporate_finance.pdf
    • https://cdn.shopify.com/s/files/1/0431/2154/1271/files/84320645473.pdf
    • https://cdn.shopify.com/s/files/1/0432/4845/1739/files/42546413490.pdf
    • https://cdn.shopify.com/s/files/1/0429/7018/5879/files/75320132752.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93336639176.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/duveloxanuginatek.pdf
    • https://cdn.shopify.com/s/files/1/0431/5080/3099/files/94711161573.pdf
    • https://cdn.shopify.com/s/files/1/0430/5754/5365/files/tugukesuzekidabejomugavi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4364/9698/files/mavuxiriral.pdf
    • https://cdn.shopify.com/s/files/1/0438/3657/1805/files/29415148644.pdf
    • https://cdn.shopify.com/s/files/1/0428/9029/7507/files/97081252646.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/surofizedixupipusibira.pdf
    • https://cdn.shopify.com/s/files/1/0435/3690/8439/files/kisabigamomifegemepif.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9292/files/73893956055.pdf
    • https://cdn.shopify.com/s/files/1/0436/0791/6707/files/6154160809.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_off000427da.bin
320fa61eebb9d6adbe591c26751aebbf0ede152780d26a79b13670012e5d176f
pdf-font-stream PDF embedded font (sfnt) at offset 0x427DA 5532 bytes
font_01_sfnt_off00043aa2.bin
f9af3b517c34c2fc98e5eb604a703d18de041f04c4fe28a933b778120b3c4acc
pdf-font-stream PDF embedded font (sfnt) at offset 0x43AA2 11372 bytes