Malicious PDF — malware analysis report

Static analysis result for SHA-256 c997ec217c69a0f2…

MALICIOUS

PDF

46.7 KB Created: 2020-08-04 13:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 160884af8d89f0395e47492912c436e1 SHA-1: 0b46c1d2dea8d7cb659b4ba071888dada112b6e0 SHA-256: c997ec217c69a0f26393fdb569473de9efd2102d12476d8dbbdbd36ed7ee92ec
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be related to PDF content and includes the malicious URL. The presence of a link farm and the ML classifier's high confidence score further support the malicious nature of this document. The primary attack vector is likely social engineering via a deceptive link.

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=teori+agenda+setting+adalah+pdf
    • http://gosut.annoushkadeightonacupuncture.com/uploads/1/3/1/4/131411896/jokuveb.pdf
    • http://files.rochonsands.net/uploads/1/3/0/8/130814055/0863beefb8e3e9.pdf
    • http://files.asimpleido.net/uploads/1/3/1/4/131438216/592a55938e8f98.pdf
    • https://cdn.shopify.com/s/files/1/0434/9162/3074/files/asma_ul_husna_and_their_benefits_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3823/5031/files/nudupuvusufovomuliroxuge.pdf
    • https://cdn.shopify.com/s/files/1/0428/8770/8825/files/43482416508.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mirizopenifipometetotagoz.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/xeretapenobobope.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/wexotuvuxikejes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ketotojugidumirazi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/96096731215.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zizamazigunonafimav.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nifafujejugafux.pdf
    • https://cdn.shopify.com/s/files/1/0435/4555/9189/files/britney_spears_criminal_russian_cover_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.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_off00007937.bin
3a25bc37a52b54499f6d4cfbd723a0de867427e263699071ca34d6e3a60ac028
pdf-font-stream PDF embedded font (sfnt) at offset 0x7937 5252 bytes
font_01_sfnt_off00008b0d.bin
eba722649917190f3fd74e9abe006b70ece6075cfeec3d1fb7fe02e8be7f8d81
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0D 10040 bytes