Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3671696e4a40df…

MALICIOUS

PDF

192.1 KB Created: 2020-08-24 07:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb321ab07a1b85828852e269b946cc56 SHA-1: ffeaa84a258850a0e9128c1f1a30c160db2dbbb4 SHA-256: 7f3671696e4a40dffb03b348eda15add8799261062278d5f91ebb65871f16f2e
92 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link. The embedded URL, 'https://ttraff.cc/pify?keyword=esc+valvular+heart+disease+guidelines+2012', is the primary indicator of malicious intent. The document body, though heavily obfuscated, also contains this URL, suggesting it's the intended lure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.cc/pify?keyword=esc+valvular+heart+disease+guidelines+2012
    • http://tijadep.850plants.com/uploads/1/3/0/7/130739344/gamiteduzalare-nodejezefago-rewuvej.pdf
    • http://files.paloaltochineseschool.org/uploads/1/3/1/8/131856225/nenonotebu-vukigijatade.pdf
    • http://files.centralbusinessdistrict.com/uploads/1/3/0/9/130969083/batewazelerawilu.pdf
    • http://goxorur.elliottkronenfeld.com/uploads/1/3/0/7/130775413/76a0572f32d12.pdf
    • http://files.wilsonpta.com/uploads/1/3/0/7/130775245/804404.pdf
    • https://cdn.shopify.com/s/files/1/0439/0433/6040/files/cataracts_surgery.pdf
    • https://cdn.shopify.com/s/files/1/0435/1157/8776/files/biomath_paces.pdf
    • https://cdn.shopify.com/s/files/1/0453/6886/9019/files/pizonoberalazidagukuji.pdf
    • https://cdn.shopify.com/s/files/1/0433/2067/2409/files/sikodozemutibozizod.pdf
    • https://cdn.shopify.com/s/files/1/0436/6453/9798/files/44519632586.pdf
    • https://cdn.shopify.com/s/files/1/0433/4849/2438/files/wivuvatajisesunimiza.pdf
    • https://cdn.shopify.com/s/files/1/0433/4452/7528/files/jozatinowagiruxobobu.pdf
    • https://cdn.shopify.com/s/files/1/0440/2115/3957/files/linear_approximation_problems_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0435/9880/7202/files/ecommerce_template_free_w3layouts.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_off00029a6c.bin
0c9b3a8f23d9a4af4d428c5e7afe66bba86755eb7e2949b8c434eeb78aa266d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x29A6C 5544 bytes
font_01_sfnt_off0002ad4a.bin
aa304564f65b7dad35e7b45e8a0e588c39927a73f6207fec363fb2a987d1c55f
pdf-font-stream PDF embedded font (sfnt) at offset 0x2AD4A 15448 bytes
font_02_sfnt_off0002dd16.bin
49436f94d5abf10ca6af8af9848174aab82dfe7bc58a5146411d238fd5c76648
pdf-font-stream PDF embedded font (sfnt) at offset 0x2DD16 16148 bytes