Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b34a3b25561e479…

MALICIOUS

PDF

42.8 KB Created: 2020-10-29 18:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8366fd436fbd4d8e61439865f95af124 SHA-1: 72bff847bfd5974204f9b5c4c3d030f9522f0b50 SHA-256: 9b34a3b25561e479516f1eb81f27e3ad95d1e8b7a6dd9924135fb565146c800e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a critical heuristic firing for a malicious redirector link. Another critical heuristic indicates a PDF link farm, suggesting the document is part of a larger SEO poisoning or traffic generation scheme. The ML classifier also strongly flagged this PDF as malicious.

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://ggtraff.ru/aws?keyword=what+is+hypodense+on+ct
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/1515306.pdf
    • https://pojetepanale.weebly.com/uploads/1/3/4/3/134361345/zovitabejeli-notenaxapiwuvow-vekovudabo.pdf
    • https://kizujaxaluw.weebly.com/uploads/1/3/4/3/134393650/1045810.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/313ab5ab-c80b-447c-b24d-81c966f68bf5/nasavinijalija.pdf
    • https://cdn.shopify.com/s/files/1/0266/8717/6902/files/xavepazezafarejabaven.pdf
    • https://cdn.shopify.com/s/files/1/0502/8534/6998/files/seek_thermal_compact_pro_apk.pdf
    • https://s3.amazonaws.com/baritexovopa/45815158159.pdf
    • https://s3.amazonaws.com/resixexi/13219885917.pdf
    • https://uploads.strikinglycdn.com/files/10b1c27e-2715-4d96-a582-b2f510eb7f55/mixulipifubevakodatureluk.pdf
    • https://uploads.strikinglycdn.com/files/a9b29e27-7180-44bb-a34c-1ec65da4c404/fisalarewukexipulawalu.pdf
    • https://uploads.strikinglycdn.com/files/0089e56e-3adc-44a3-9422-6a3544178a0a/79650070598.pdf
    • https://s3.amazonaws.com/suzitivasekoga/laxoz.pdf
    • https://uploads.strikinglycdn.com/files/b10d40ed-6b1d-4e8b-a5d3-7401b1bbf9b6/litenudekufedogefen.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_off00006813.bin
b5c45720c28808cbbf14d7cf0123f8ba7cd3a3635784cc77e1010a415a9de7e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6813 5148 bytes
font_01_sfnt_off000079a9.bin
8d6545e1a6bbcbcb5dd2bc7d5c2b2e95fc23702d3f01eedfde1323a61b8f3cd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x79A9 10948 bytes