Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a19fe23237307bf…

MALICIOUS

PDF

39.8 KB Created: 2020-08-24 14:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8190438dae4be38f7d818c4129ea7984 SHA-1: d2a3d9c6ed097bdb43af4254195faee93f81bdac SHA-256: 4a19fe23237307bfbe274127f54e23be36d24157620cd085436ff906d62ced2f
128 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, including one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a worksheet answer key, which is a common lure. The primary malicious link, 'https://ttraff.ru/pify?keyword=naming+ionic+compounds+worksheet+answers+page+45', is likely used to deliver a secondary payload or redirect to a phishing site.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=naming+ionic+compounds+worksheet+answers+page+45
    • http://files.edtechtalk.org/uploads/1/3/2/7/132740905/8d9f0ad0a.pdf
    • http://nizeledev.anamcarafolkmusic.com/uploads/1/3/2/8/132816202/f5dd3409b1d8.pdf
    • http://files.missionbeachaustralia.com/uploads/1/3/0/7/130738501/2967423.pdf
    • https://cdn.shopify.com/s/files/1/0440/1378/1157/files/credit_reporting_bureau_news.pdf
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/sekumam.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/66645191581.pdf
    • https://cdn.shopify.com/s/files/1/0434/7478/0312/files/polmicas_na_igreja_augustus_nicodemus.pdf
    • https://cdn.shopify.com/s/files/1/0434/6901/3158/files/shockwave_marble_mania.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8428/files/rotuzononutupafaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/7314/1912/files/designing_data-_intensive_applications_filetype.pdf
    • https://cdn.shopify.com/s/files/1/0431/8131/0114/files/18776476097.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/64651630376.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/zisutagojefelakagowafuniz.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_off0000593a.bin
fcb16a79a079a15df79e58885c0520a1199e77ee68b53bb305565b96e748310f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x593A 5792 bytes
font_01_sfnt_off00006ce2.bin
89c1e9e20254284c13fdf3c0737c282b405276b63b163e74e83928dd02337e88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE2 11052 bytes

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