Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c98b1de3a848707…

MALICIOUS

PDF

47.7 KB Created: 2020-07-28 17:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eca631b666bc93d12141f793785aa121 SHA-1: 0d0441d3769c8ea5850ebf4a49dd77a815a41854 SHA-256: 5c98b1de3a84870799b31a82548afb1bd6cc6b98d9cb98420bf6e3c2121a7d0e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, suggests a lure related to a 'yearbook ladder template'. The presence of a malicious redirector link and a large number of external PDF links indicates an attempt to drive traffic to malicious sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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
  • 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=yearbook+ladder+template+pdf
    • http://files.joshuajberryhealingarts.com/uploads/1/3/0/8/130814106/1484107.pdf
    • http://files.tatianawechsler.com/uploads/1/3/1/8/131857117/874f9450f3240d.pdf
    • http://files.manatsutanaka.com/uploads/1/3/0/7/130739450/411199.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/43787072159.pdf
    • https://cdn.shopify.com/s/files/1/0439/0522/0776/files/wajaxediga.pdf
    • https://cdn.shopify.com/s/files/1/0429/9541/7237/files/94270428777.pdf
    • https://cdn.shopify.com/s/files/1/0432/2761/1295/files/nemidetipera.pdf
    • https://cdn.shopify.com/s/files/1/0440/3098/4357/files/jerazubukebakumazosu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97072231683.pdf
    • https://cdn.shopify.com/s/files/1/0430/7651/8049/files/71281458900.pdf
    • https://cdn.shopify.com/s/files/1/0428/3957/2643/files/modoveromepusatatuvu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9493/3665/files/61735904320.pdf
    • https://cdn.shopify.com/s/files/1/0429/6219/0489/files/mosus.pdf
    • https://cdn.shopify.com/s/files/1/0429/2545/7574/files/12190781148.pdf
    • https://cdn.shopify.com/s/files/1/0429/6291/1391/files/zubulegakaropogenes.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/jegekabinugujapekakut.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/telisupuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/6827/7415/files/63270017091.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d23.bin
3cddd83ab0513c66c311be49a0a8dd3ed5a4a1e7414466717ecd859967f754d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D23 4808 bytes
font_01_sfnt_off00008d77.bin
be7b6ab24930f35b25de6e4e0dc16108f0bcdf69f0a36a04e5923fe0463c8ac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D77 10784 bytes

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