Malicious PDF — malware analysis report

Static analysis result for SHA-256 0528bdf4270f9667…

MALICIOUS

PDF

52.1 KB Created: 2020-08-09 10:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4875b7c7823389be7cbfd54889d19648 SHA-1: 8a4652ed71efd49851426054e77b258f32da5885 SHA-256: 0528bdf4270f96671725efadd7cd56b51450d29a1a85f00be157dfd4f2934db9
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF SEO link farm pattern with numerous external PDF links, many hosted on Shopify. The embedded URL in the document body, 'https://ttraff.com/pify?keyword=alfabeto+hebreo+espa%25C3%25B1ol+pdf', likely serves as the initial lure to a malicious site. No scripts were extracted, but the structure suggests a phishing or SEO poisoning attempt.

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=alfabeto+hebreo+espa%25C3%25B1ol+pdf
    • http://files.alisonjerrydesigns.com/uploads/1/3/1/0/131070327/6f89fc3a5877.pdf
    • http://files.robertknudson.com/uploads/1/3/1/3/131380440/07cf0aa6b6.pdf
    • http://files.realwalks.com/uploads/1/3/1/4/131453522/cbab6482.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1220/2389/files/dujokunerezet.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9588/files/42752401569.pdf
    • https://cdn.shopify.com/s/files/1/0433/9505/5777/files/e5_b0_86_e5_a4_9c2.pdf
    • https://cdn.shopify.com/s/files/1/0430/6265/7177/files/kekafemagojo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tugogesobiwem.pdf
    • https://cdn.shopify.com/s/files/1/0431/2409/7191/files/tinanarokoraxowim.pdf
    • https://cdn.shopify.com/s/files/1/0429/2945/5271/files/42920791818.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0503/files/filosedilokamabenikuwojij.pdf
    • https://cdn.shopify.com/s/files/1/0431/8514/3969/files/xidumafovikajewu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6111/6064/files/46315196491.pdf
    • https://cdn.shopify.com/s/files/1/0432/8187/5112/files/rewefesidatevoraru.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_off00006f53.bin
9b1304cd58a9a0dd3fa4d1aa8f89856e3973d614938ae4dc1bb527bd9fd396b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F53 5472 bytes
font_01_sfnt_off0000819a.bin
281d728b04ebe7f64686fe4d205d87799189039edb53ff3b62c77293c6cafa92
pdf-font-stream PDF embedded font (sfnt) at offset 0x819A 22232 bytes