Malicious PDF — malware analysis report

Static analysis result for SHA-256 859de4b8df5d7130…

MALICIOUS

PDF

42.9 KB Created: 2020-08-24 06:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24852da66312f53d87caea9db0ad865d SHA-1: e75a179ca0bef7861d6b9432337736cc8c044635 SHA-256: 859de4b8df5d713094db17db22bba481f9ff9d428f6c05513946f88b3a3577eb
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that leads to a malicious redirector and several benign-looking Shopify links, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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=why+answer+to+everything+book+online
    • http://sukuda.monicarayscott.com/uploads/1/3/0/7/130776433/kokidipitaleto-duvevaku-tisovibavike.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5192/5155/files/xesebosunulup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/83718887378.pdf
    • https://cdn.shopify.com/s/files/1/0429/2060/7900/files/36812998593.pdf
    • https://cdn.shopify.com/s/files/1/0435/6446/6335/files/job_letter_sample_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/sony_scd-_ce595.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/funonu.pdf
    • https://cdn.shopify.com/s/files/1/0446/8968/6681/files/23062962839.pdf
    • https://cdn.shopify.com/s/files/1/0440/4012/6614/files/nomebigijupexomos.pdf
    • https://cdn.shopify.com/s/files/1/0434/0586/9213/files/63982680415.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/wapajalizijamofolov.pdf
    • https://cdn.shopify.com/s/files/1/0451/8638/4023/files/runiwividowuporu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9551/4535/files/53870742665.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_off000067b2.bin
3f4719a035162eca7794e0ae999b82e164c40055863d1629076d431921496ccc
pdf-font-stream PDF embedded font (sfnt) at offset 0x67B2 5416 bytes
font_01_sfnt_off00007a3b.bin
4e1a23c34953a5c72a0ece87ee47f7b53a2a3cf9977cf5d203441b84aab386bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3B 10680 bytes