Malicious PDF — malware analysis report

Static analysis result for SHA-256 491c1c301330c4e9…

MALICIOUS

PDF

43.3 KB Created: 2020-08-16 20:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fce5c8309ec8f44e5f2ca75f888e7ed4 SHA-1: 55f96982e27de9579289c69bb092f8a732e9d319 SHA-256: 491c1c301330c4e9e3f1da795bf30e58c9c6a31426c82ef1ceb8c340de4f41e6
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, another critical heuristic identified it as a link farm, with numerous external PDF links, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a malicious site.

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.com/pify?keyword=seismic+isolation+devices+pdf
    • http://files.sutterandassociates.com/uploads/1/3/1/6/131606343/6869718.pdf
    • http://files.kissthechefllc.com/uploads/1/3/0/7/130776374/f52f9056.pdf
    • https://cdn.shopify.com/s/files/1/0430/8815/0690/files/auditing_assurance_services_in_australia_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/sutuzorigomuwop.pdf
    • https://cdn.shopify.com/s/files/1/0432/3698/2944/files/loxejobojuzonuk.pdf
    • https://cdn.shopify.com/s/files/1/0436/3363/9584/files/nitemowilezarogibujuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/5704/5916/files/65322338386.pdf
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/kuxofiriwiruv.pdf
    • https://cdn.shopify.com/s/files/1/0430/7219/2669/files/neumona_aspirativa_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0432/0215/0557/files/7949972577.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_off00006a0e.bin
eaedb646da23bfed4e8171fef8b18d2505ba13b73a5531e6af73f39ff68e5631		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0E 5368 bytes
font_01_sfnt_off00007c3e.bin
38a9304dfbc24df473db718cdfe00092aa0bcba325719b94919edfcf333ee667		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3E 10656 bytes

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