Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a906d8d94e0fa9e…

MALICIOUS

PDF

42.3 KB Created: 2020-08-29 21:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a94f5f9d95caf6a9f26d9f8668aa406 SHA-1: 12245f7997712c609f56820bfedda11c589f1dd8 SHA-256: 5a906d8d94e0fa9ef423167418f113ec21cab77a74f340c8d5228ad6efe10503
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded URLs, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of a link farm suggests an attempt to distribute malicious content or engage in SEO poisoning to lure victims.

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.ru/wix?keyword=new+mexico+nudes
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/353d00_7921d81b9a7f426cace95f1fa1022981.pdf
    • https://static.usrfiles.com/ugd/b8c837_66e04090aa0b4d32b50ab3a6a798f051.pdf
    • https://static.usrfiles.com/ugd/353d00_1184a9e7989f46bcb798312f21ab1415.pdf
    • https://static.usrfiles.com/ugd/b8c837_77d5cd66096546239a803f590a49dee6.pdf
    • https://static.usrfiles.com/ugd/a382ee_18e0647457294700807cd1891ed08a05.pdf
    • https://cdn.shopify.com/s/files/1/0433/5229/3541/files/roxuzopisubatutozanalo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7693/5068/files/agro_ecological_zones_of_bangladesh.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/10438127842.pdf
    • https://cdn.shopify.com/s/files/1/0462/5901/1735/files/bejonufigapejazewifazur.pdf
    • https://cdn.shopify.com/s/files/1/0428/4071/9516/files/12328550991.pdf
    • https://cdn.shopify.com/s/files/1/0429/1526/6713/files/65642411860.pdf
    • https://cdn.shopify.com/s/files/1/0431/6908/7642/files/aurelia_js_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0439/1328/1691/files/rokuxugujemalugadovujerot.pdf
    • https://cdn.shopify.com/s/files/1/0431/0633/6930/files/25777561561.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_off000068e1.bin
bd8b9180f059d83367af02e870f486e47afcb798047411a8a0385fb682656239
pdf-font-stream PDF embedded font (sfnt) at offset 0x68E1 4876 bytes
font_01_sfnt_off0000797c.bin
5a599e87adca1614665f6f1f1a6d7cee88ffd5c1af2c495c7af78f4b97771371
pdf-font-stream PDF embedded font (sfnt) at offset 0x797C 10360 bytes