Malicious PDF — malware analysis report

Static analysis result for SHA-256 d527de7e699af375…

MALICIOUS

PDF

33.3 KB Created: 2020-08-05 17:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4616590a26a176ed47bfbf70f3918e5 SHA-1: 22f8489fb30a5450d987bc817cd9c0a8edc099a8 SHA-256: d527de7e699af375439aa831f64f53fb8c30b28fa587b3e3d3ecb3b906527fb1
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains and other file-hosting services, likely to obscure the malicious redirector. The primary malicious URL, https://ttraff.com/pify?keyword=artificial+intelligence+a+modern+approach+amazon+pdf, is a known redirector. The document body, though heavily obfuscated, contains this URL and other PDF links, suggesting a lure to download a seemingly legitimate document that instead leads to malicious infrastructure.

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.com/pify?keyword=artificial+intelligence+a+modern+approach+amazon+pdf
    • http://files.strathmorechildrenschoir.com/uploads/1/3/0/7/130739222/8739174.pdf
    • http://files.tmoonphotography.com/uploads/1/3/0/7/130776655/ratepu.pdf
    • http://files.dronemetrics.ca/uploads/1/3/0/7/130776521/tokipopuno.pdf
    • https://cdn.shopify.com/s/files/1/0434/4299/5352/files/zovivalesofivuvupigele.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2245/files/96972090586.pdf
    • https://cdn.shopify.com/s/files/1/0434/3080/5671/files/32642217288.pdf
    • https://cdn.shopify.com/s/files/1/0433/7346/1669/files/ave_maria_gounod_violino.pdf
    • https://cdn.shopify.com/s/files/1/0428/9029/7507/files/ruxitimosoribojutomexadu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3287/0037/files/fezavux.pdf
    • https://cdn.shopify.com/s/files/1/0431/2806/2109/files/pusudelorixozivemerufa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22411539251.pdf
    • https://cdn.shopify.com/s/files/1/0432/0077/4307/files/voltage_transformer.pdf
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/85944584631.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_off00004431.bin
8b028a575f8f4ae05f2a39b3bfaaa114a7c524981d6bb16cb87314633e97859b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4431 5428 bytes
font_01_sfnt_off0000568a.bin
b8b340cf834d5c50ef0cd015b70d4c201d116a4889cd67e0e16709cc89cc8345
pdf-font-stream PDF embedded font (sfnt) at offset 0x568A 10000 bytes