Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50444a9e5545df3…

MALICIOUS

PDF

45.3 KB Created: 2020-07-30 18:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d170142a836823a5c6b037e3aabbe0ca SHA-1: 5e7c88a31c60e908e3d0e693701f3409bafd6c8f SHA-256: b50444a9e5545df3f4d99d9df675194f9b08ef7ef389b64ce11fa2f346da496a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be SEO poisoning or phishing, leveraging a link farm to direct users to harmful sites.

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/pify?keyword=cedaw+philippines+pdf
    • http://files.jxli.net/uploads/1/3/0/7/130775997/1522425.pdf
    • http://files.dazzlingstreaks.com/uploads/1/3/1/4/131438641/filotabivaxope.pdf
    • http://files.teramorock.com/uploads/1/3/0/7/130775055/7885864.pdf
    • http://files.jstarkdesign.com/uploads/1/3/0/7/130776561/xiluviruderizite.pdf
    • http://files.bravechoicesmn.com/uploads/1/3/2/7/132740692/3102480.pdf
    • http://files.jxli.net/u
    • https://cdn.shopify.com/s/files/1/0435/7786/8443/files/vaviborefuva.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/95494093261.pdf
    • https://cdn.shopify.com/s/files/1/0438/4037/2896/files/folinizanati.pdf
    • https://cdn.shopify.com/s/files/1/0434/9542/4165/files/mizavobukatakabufep.pdf
    • https://cdn.shopify.com/s/files/1/0428/6903/1078/files/nagisusoxa.pdf
    • https://cdn.shopify.com/s/files/1/0434/1465/1038/files/pavijifomavarusejebuwux.pdf
    • https://cdn.shopify.com/s/files/1/0428/5172/9567/files/guxexularaminix.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16485275060.pdf
    • https://cdn.shopify.com/s/files/1/0439/2642/1672/files/60796475259.pdf
    • https://cdn.shopify.com/s/files/1/0431/0210/9856/files/4490058218.pdf
    • https://cdn.shopify.com/s/files/1/0434/8834/6262/files/pimasumabifatufozu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/3084242343.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_off000076bc.bin
541690c95b5ded13e47499022db74712eba545f4562a618637c9781a9dc7accd
pdf-font-stream PDF embedded font (sfnt) at offset 0x76BC 4748 bytes
font_01_sfnt_off000086df.bin
d8b9e01253647d1e62d17086b4bb09909ee83f9ca8ff77d6a2f1b81fb80ad2de
pdf-font-stream PDF embedded font (sfnt) at offset 0x86DF 9824 bytes