Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85d988882d27b9a…

MALICIOUS

PDF

44.2 KB Created: 2020-08-05 17:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f822c06b44b75d3fdf74559390a297d3 SHA-1: 712f0dd639fb6e3c001b17df42750d3fdcb563df SHA-256: a85d988882d27b9a986ef7dfd2343ec4157a062263c5b689b04f927d7b7820f0
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 pointing to Shopify domains hosting other PDFs, which is indicative of a link farm. One of the primary links, 'https://ttraff.cc/pify?keyword=variedades+de+cafe+robusta+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this redirector and other PDF links, suggesting a lure to external malicious content.

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=variedades+de+cafe+robusta+pdf
    • http://files.friends4metromotors.com/uploads/1/3/0/8/130814680/fojetuli.pdf
    • http://ritazeta.apolloghosts.com/uploads/1/3/0/7/130739919/e7f5ffcfc553f82.pdf
    • http://files.battlegroundfp.com/uploads/1/3/1/3/131379115/d06b8c57.pdf
    • https://cdn.shopify.com/s/files/1/0433/0219/1269/files/ccleaner_serial_key.pdf
    • https://cdn.shopify.com/s/files/1/0432/0080/7070/files/95062030404.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nezaneseku.pdf
    • https://cdn.shopify.com/s/files/1/0436/8292/2646/files/firasomalavilexujibuniwa.pdf
    • https://cdn.shopify.com/s/files/1/0433/2381/8139/files/33996223951.pdf
    • https://cdn.shopify.com/s/files/1/0445/7719/4148/files/mojang_account_recovery.pdf
    • https://cdn.shopify.com/s/files/1/0432/0883/5229/files/xomelabugitividival.pdf
    • https://cdn.shopify.com/s/files/1/0427/9799/0055/files/suwavemekimelarudo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9091/2159/files/11862532767.pdf
    • https://cdn.shopify.com/s/files/1/0432/1397/9812/files/44074354443.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fe4.bin
e47551a09cc91add2cde9a41091666ebdee8b1e602adb5a06ce7fde43a2d92e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE4 5000 bytes
font_01_sfnt_off000070f1.bin
940c21c75842683fb9d190ae1c74aec56051229f5495896214650b0195082826
pdf-font-stream PDF embedded font (sfnt) at offset 0x70F1 10932 bytes
font_02_sfnt_off000094a8.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x94A8 4324 bytes