Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6fd51b7b9a02bc…

MALICIOUS

PDF

36.6 KB Created: 2020-08-16 19:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be63c82a3514cd928869aca9e0728cc0 SHA-1: d678d004dff13a743842958b54cb6baa3023ea39 SHA-256: 6f6fd51b7b9a02bcca9e40a33f0901db6c937ecbd7f9a4b03c3e33c7ab808cc3
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.ru/pify?keyword=i+am+an+albatraoz+remix+ringtone, is flagged as a malicious redirector. The document also exhibits characteristics of a link farm, with numerous external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly indicates malicious intent.

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=i+am+an+albatraoz+remix+ringtone
    • http://files.fcampagnari.com/uploads/1/3/1/6/131636654/gisidixobujur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/4459/1000/files/dusananejo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dubisetebezurazoxodo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0790/9794/files/epidemiologia_clinica_laura_moreno_altamirano.pdf
    • https://cdn.shopify.com/s/files/1/0429/2060/7900/files/46456982157.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/11643955949.pdf
    • https://cdn.shopify.com/s/files/1/0427/7580/6119/files/volosifamapati.pdf
    • https://cdn.shopify.com/s/files/1/0430/7746/8327/files/72843079741.pdf
    • https://cdn.shopify.com/s/files/1/0429/1330/0647/files/62568649039.pdf
    • https://cdn.shopify.com/s/files/1/0435/4372/4186/files/630442516.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_off000048f1.bin
a8428f9a82177b59bf27ee675ee5742857cfface4babec99c011760207a928eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48F1 5024 bytes
font_01_sfnt_off000059fa.bin
48437ebf62ae17bb5a1ab1ebca604787d6e505f466e3e3e6dda69a127305c41f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59FA 14348 bytes

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