Malicious PDF — malware analysis report

Static analysis result for SHA-256 01a3bfb6889343c5…

MALICIOUS

PDF

35.1 KB Created: 2020-08-17 06:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4b72c08be1fae74a132afa6f97d3104 SHA-1: 2cd7e9c19385ff55841e998b4e255e1dfa140e3f SHA-256: 01a3bfb6889343c5a623043893c0af78cecd8f1f8f886d784c646d5d8885fe4e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript

The PDF was flagged by a machine learning classifier and contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also present in the list of embedded URLs. This suggests the PDF is designed to redirect users to malicious content through a link farm.

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=brothers+movie+song+sapna+jahan+ringtone
    • http://lowim.instituteforeap.com/uploads/1/3/0/7/130738524/19ea104.pdf
    • http://files.gersongirls.com/uploads/1/3/1/4/131453894/8158a2b16cbbd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/9696/4261/files/fejifafexirevogugirel.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2042/files/22048450103.pdf
    • https://cdn.shopify.com/s/files/1/0434/7750/0056/files/bluestacks_ad_skipper.pdf
    • https://cdn.shopify.com/s/files/1/0435/3739/9960/files/5049567971.pdf
    • https://cdn.shopify.com/s/files/1/0430/0124/9955/files/16383154737.pdf
    • https://cdn.shopify.com/s/files/1/0432/4281/5643/files/pubuvafidozumejibapo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2183/6193/files/96026549258.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1068/files/unfair_dismissal_appeal_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0434/3001/9237/files/aphasie_globale.pdf
    • https://cdn.shopify.com/s/files/1/0429/4852/6246/files/tuvawi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1164/4324/files/islamic_banking_system_in_nigeria.pdf
    • https://cdn.shopify.com/s/files/1/0435/2511/1972/files/jenidixawamikom.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_off00004bf0.bin
a0b1ff9c100789641361a728e95caf47e6d8f5d93a55339df8d0fab8a86156c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x4BF0 5384 bytes
font_01_sfnt_off00005e2e.bin
4ab828b58eebf9e29e17ad4a44d88a6ad6fc2324b9d6dd1d22dd4504a1782fe0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2E 9764 bytes