Malicious PDF — malware analysis report

Static analysis result for SHA-256 725007c73cdd4195…

MALICIOUS

PDF

47.3 KB Created: 2020-07-29 19:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c007ae3a626229ea4eccf09f0be163d1 SHA-1: ee82b9e7697a0ea93c8bbe50a6ad650b564f6809 SHA-256: 725007c73cdd4195480747b6206b2bf59f40ae867f684c12ab108455ec59bc41
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to redirector infrastructure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links suggests an attempt to distribute malware or phish for credentials. No scripts were extracted, but the overall structure and link farm indicate a malicious intent to redirect users to potentially harmful 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.com/pify?keyword=free+printable+certificates+of+completion+pdf
    • http://files.garhorizons.com/uploads/1/3/1/4/131406885/makikonigofaruvarito.pdf
    • http://files.audia2dp.com/uploads/1/3/1/4/131408142/6904652.pdf
    • http://files.oxforddemocracycafe.org/uploads/1/3/1/8/131871787/lijame-faporaluzaxir-rijazariwetale-nadurawarut.pdf
    • http://files.danieleheon.com/uploads/1/3/1/6/131637190/kariwize_jefigi_xonevo_gijipoze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/dikitanu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4387/2153/files/zoxud.pdf
    • https://cdn.shopify.com/s/files/1/0435/4536/2591/files/43337227709.pdf
    • https://cdn.shopify.com/s/files/1/0434/0989/9670/files/3197628281.pdf
    • https://cdn.shopify.com/s/files/1/0428/7810/7811/files/fomovagowu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0909/7376/files/9799792148.pdf
    • https://cdn.shopify.com/s/files/1/0433/4331/5102/files/48287678005.pdf
    • https://cdn.shopify.com/s/files/1/0432/5264/6050/files/mefodalowaxitoninot.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mulobovapu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1401/9496/files/57268426254.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9755/files/54691977792.pdf
    • https://cdn.shopify.com/s/files/1/0435/9602/1919/files/79263091465.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/4766051859.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_off00007ac7.bin
52069305793102ff19f79db903f7d24d26ae98a88ac5ab9d873240f0c3aff428		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC7 5184 bytes
font_01_sfnt_off00008c3c.bin
321f6e93bd7dbc5dacd58c52f0c9e80cbac4dc0c496925f7fe511cc820696d36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C3C 10280 bytes

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