Malicious PDF — malware analysis report

Static analysis result for SHA-256 2422710fa49b43d3…

MALICIOUS

PDF

40.9 KB Created: 2020-08-03 23:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2d58fc1ec7fd7a972aabe6712913c8b SHA-1: 5f2d6ea0a6f6a7e6c9699b3319012a55f5083793 SHA-256: 2422710fa49b43d30a13c47a3f841ef485701d18d3f66acfe32f948d6a4b9e20
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.cc. The document body text, though heavily obfuscated, includes the title 'Anemia ferropenica ni os pdf' and the malicious URL, suggesting a lure to trick users into clicking through to potentially malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=anemia+ferropenica+ni%25C3%25B1os+pdf
    • http://files.cottonginmuseum.com/uploads/1/3/1/3/131380849/kotevuwefapu.pdf
    • http://files.carolinastormhedgehogs.com/uploads/1/3/1/6/131637291/fanipewonosewagafuv.pdf
    • http://xuzimuxux.hairbyjodieyoung.com/uploads/1/3/0/7/130775997/nipudujafavikirexu.pdf
    • http://files.andrewthompsonsongs.com/uploads/1/3/0/7/130775934/sasezegu-soziwoxosodu-tuzemuzejexi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4959/1718/files/alert_document_cookie.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0138/files/vejevuvamuz.pdf
    • https://cdn.shopify.com/s/files/1/0429/2316/3801/files/96424414072.pdf
    • https://cdn.shopify.com/s/files/1/0434/8251/3570/files/3911748539.pdf
    • https://cdn.shopify.com/s/files/1/0431/4690/3701/files/bebavunisezejividotek.pdf
    • https://cdn.shopify.com/s/files/1/0435/3284/5207/files/duvunojudazorepawopukib.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90685913575.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/76626827754.pdf
    • https://cdn.shopify.com/s/files/1/0431/7039/8357/files/wolujilexefipunogapebe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fejatomamegebuwugibuvu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/kutodejezakobojo.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_off00005f9f.bin
8e78707338bee31d18138e066cf78b49f77e062df07ef9b52862a80e21c601b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9F 5468 bytes
font_01_sfnt_off000071e3.bin
c67afd581d6820d233a4502e069c932d0119caa0824dd08391a2a152d00de3c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x71E3 10332 bytes