Malicious PDF — malware analysis report

Static analysis result for SHA-256 21dc4e2b04dd44fa…

MALICIOUS

PDF

39.9 KB Created: 2020-08-17 11:39:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf01d95958e59641b3501889230b70d1 SHA-1: 86988303744fff09299499a0afecd51b19ab0308 SHA-256: 21dc4e2b04dd44fa566a807e70925f24f2e601ddb595668a5445be1ec361a410
92 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, specifically a URL associated with a job offer lure. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be social engineering via a deceptive link within the document.

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.
  • 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=job+offer+counter+proposal+template
    • http://files.masteringtheartofsomething.com/uploads/1/3/1/4/131407102/kaduwux_tabobakedo.pdf
    • http://kemidim.epicgeekshop.com/uploads/1/3/1/4/131437594/jafelituretoron.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1507/files/sovokofinajipowuxizuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/4468/3419/files/bandit_s_moon.pdf
    • https://cdn.shopify.com/s/files/1/0429/5193/4108/files/31832858220.pdf
    • https://cdn.shopify.com/s/files/1/0430/3264/1689/files/android_transfer_file_over_wifi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4485/5194/files/water_sports_vocabulary.pdf
    • https://cdn.shopify.com/s/files/1/0428/4815/7859/files/create_gh-_pages_branch.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/12875207208.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_off00005dc0.bin
444b4c7a3871fe3220af4a89de50dbbf7f5602a8e9c06eb41f0e40dbf0d628c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC0 5288 bytes
font_01_sfnt_off00006faa.bin
546b34043ea5f6d770adac7b38e384db7df737eb4e9933bb44b181da2c7181d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FAA 10464 bytes

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