Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf8d2bdb2c0b30e…

MALICIOUS

PDF

56.7 KB Created: 2020-08-12 22:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ff0504fcb4903ee5221248a8f69ef1d SHA-1: 69cc06c1d6ac6212f472840e960be4e2c7826fd4 SHA-256: 4bf8d2bdb2c0b30e3c0930599c383d5a37aa425cd0be48a974cced7281826dc2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1200 Hardware Add-in T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Attachment report sample pdf kenya' and includes the malicious URL. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be a link farm designed to lure users to malicious 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=attachment+report+sample+pdf+kenya
    • http://files.beyondthegameplan.com/uploads/1/3/1/8/131857338/40516d0.pdf
    • http://files.graftonphysie.com/uploads/1/3/0/8/130813988/wuzipedawanizolitix.pdf
    • http://files.secdea-aviation.com/uploads/1/3/1/0/131069789/d76ae.pdf
    • https://cdn.shopify.com/s/files/1/0434/7078/2624/files/nukekatepum.pdf
    • https://cdn.shopify.com/s/files/1/0430/9060/8285/files/pubov.pdf
    • https://cdn.shopify.com/s/files/1/0428/3249/4751/files/1390676170.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7589/files/zuzifawezorojabitukil.pdf
    • https://cdn.shopify.com/s/files/1/0430/0875/3827/files/91790504453.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/3001/files/27211321673.pdf
    • https://cdn.shopify.com/s/files/1/0429/0222/5059/files/jorovavugevonat.pdf
    • https://cdn.shopify.com/s/files/1/0432/8197/3416/files/47585487797.pdf
    • https://cdn.shopify.com/s/files/1/0433/7814/7491/files/61330595910.pdf
    • https://cdn.shopify.com/s/files/1/0430/1661/8145/files/microsoft_employment_benefits.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/kelomoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86399573169.pdf
    • https://cdn.shopify.com/s/files/1/0432/4871/3896/files/medical_surgical_nursing_brunner_and_suddarth_14th_edition.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_off00009f19.bin
3b881c6114bcb0552e83beb748d3fd96d187fe7eed3fa0fda2712b7de736b6fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F19 5552 bytes
font_01_sfnt_off0000b1ca.bin
6855da0b6fb77c9939438b47a709ba629087e1c697be5fd37e26ee28f83ea17f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CA 10688 bytes