Malicious PDF — malware analysis report

Static analysis result for SHA-256 49512b7bc1cb8066…

MALICIOUS

PDF

52.2 KB Created: 2020-08-06 14:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7b18e77b3f2242b9aa46b9647f267d1 SHA-1: 6fae430b3b9f334dbf0897cbfb72fbb867619bc7 SHA-256: 49512b7bc1cb806696c813b5bccf1bb835c7367e178f16c49832585a4f6b9611
152 Risk Score

Malware Insights

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

The PDF contains numerous links, identified as a link farm, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector identified by heuristics. The ML classifier also strongly indicated maliciousness. The primary attack pattern is likely a phishing or scam campaign leveraging a deceptive document title to redirect users to malicious infrastructure.

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=energias+renovables+en+colombia+pdf
    • http://files.us-arabchamber.org/uploads/1/3/0/8/130813997/2172726.pdf
    • http://gewat.ekoforteang.net/uploads/1/3/1/0/131069839/gagaju.pdf
    • http://files.nycridingacademy.org/uploads/1/3/2/8/132815791/pumanodujuwi_bafepupemodam.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1123/files/safiboninizurufuj.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/tebiduwiwomazugu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2841/4618/files/97124673011.pdf
    • https://cdn.shopify.com/s/files/1/0438/1055/4016/files/72561770528.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4551/files/17201763224.pdf
    • https://cdn.shopify.com/s/files/1/0437/6566/1845/files/msn_zone_hearts.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/gigovefominavawivosaluw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1823/1709/files/11789203988.pdf
    • https://cdn.shopify.com/s/files/1/0436/0998/1085/files/63329001379.pdf
    • https://cdn.shopify.com/s/files/1/0433/7739/3815/files/73760697061.pdf
    • https://cdn.shopify.com/s/files/1/0431/8982/9800/files/jevebuwaradapesoborizoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/rovivumigo.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_off00007f3d.bin
191031553e8c67cf242afbb971e84aef6d63c0151c275ff3da633049199c301e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F3D 5632 bytes
font_01_sfnt_off00009257.bin
4df5e21482a1be0176a1dd7ee0f2a4c49ea7b5c82c8210ab1a200802b9333981
pdf-font-stream PDF embedded font (sfnt) at offset 0x9257 15904 bytes