Malicious PDF — malware analysis report

Static analysis result for SHA-256 1925d796fe7963cf…

MALICIOUS

PDF

71.0 KB Created: 2020-08-07 12:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6364e22159dd8230da9959de8843222b SHA-1: 6c287d2ffa90b12f1d70fb9237de39595cd8e750 SHA-256: 1925d796fe7963cf7b495ac778af56949ce71107e42e2f07d4249f09d366a85c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'certificado de origen' and a URL that appears to be a lure. The ML classifier strongly indicates maliciousness, and the presence of a redirector link suggests an attempt to deliver a malicious payload or conduct phishing.

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=certificado+de+origen+mexico+costa+rica+pdf
    • http://files.mr-organics.eu/uploads/1/3/0/7/130775055/c15075de64dcd.pdf
    • http://files.brightdoxies.com/uploads/1/3/1/3/131380390/fesalujem.pdf
    • http://files.stackable-chairs.eu/uploads/1/3/0/8/130874058/bosefiwazele.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2317/9677/files/ziwedoloxaxezam.pdf
    • https://cdn.shopify.com/s/files/1/0430/2176/2723/files/autumn_leaves_piano_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/palmistry_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/sotojelu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sopituwoxo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/15946481013.pdf
    • https://cdn.shopify.com/s/files/1/0435/4247/9007/files/cambridge_primary_mathematics_learner_s_book_1.pdf
    • https://cdn.shopify.com/s/files/1/0435/3749/8276/files/zezusegevagi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vinujavezo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/jebedepesedutorerivaraf.pdf
    • https://cdn.shopify.com/s/files/1/0428/1673/3340/files/626380920.pdf
    • https://cdn.shopify.com/s/files/1/0437/1939/3448/files/mijedut.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_off0000d443.bin
43f493f4308d3b14ba6dde2bfce2a29490644d3bd1d44445f4c3bf0915698e7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD443 5416 bytes
font_01_sfnt_off0000e6a3.bin
dad4bab810950390a44f52c45618dfa7cd11db59eed0944e1c06cbf93f5eafa6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 11896 bytes