Malicious PDF — malware analysis report

Static analysis result for SHA-256 8963b827e39ec4ea…

MALICIOUS

PDF

44.6 KB Created: 2020-08-05 23:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30d142c12250d5555f46d66a42269b48 SHA-1: 8bf71d3e2ced52da77b3b93003cb983efc4e42af SHA-256: 8963b827e39ec4eaecf660fd8a8a9f33ef33ce6d36f8f3975f83cd8bad8d93b6
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector identified by heuristics. The primary intent appears to be directing users to malicious infrastructure, likely for further exploitation or credential harvesting.

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=tratamento+cirrose+hepatica+pdf
    • http://files.linlinkyawhtet.com/uploads/1/3/0/7/130776489/7908300.pdf
    • http://pesuzu.burtonsmaplewoodfarm.com/uploads/1/3/1/1/131164239/2461496.pdf
    • http://files.healthymamahappymama.com/uploads/1/3/1/4/131454151/3e94d773.pdf
    • https://cdn.shopify.com/s/files/1/0428/1355/4855/files/49873505484.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/importance_of_behavioural_objectives.pdf
    • https://cdn.shopify.com/s/files/1/0432/6565/4939/files/96918671375.pdf
    • https://cdn.shopify.com/s/files/1/0439/4260/9051/files/13029309330.pdf
    • https://cdn.shopify.com/s/files/1/0433/3918/6344/files/naive_bayesian_classifier.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3431/files/vuvovuvub.pdf
    • https://cdn.shopify.com/s/files/1/0429/2735/8115/files/82268879405.pdf
    • https://cdn.shopify.com/s/files/1/0428/4848/5535/files/85115484718.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6839/files/juriwopa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9463/8749/files/kabevoketivikilumikak.pdf
    • https://cdn.shopify.com/s/files/1/0440/6693/0840/files/ragowazuzerupir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000631a.bin
299824e709bf35391e2b32cbbcc89e7bd2db6048068eb4acc66aea36631a75f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x631A 5100 bytes
font_01_sfnt_off00007435.bin
923e2f3fc05c078a45abc34d33f87de16e34b19e98be05ba6f00be64528d261e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7435 10320 bytes
font_02_sfnt_off00009788.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x9788 4324 bytes