Malicious PDF — malware analysis report

Static analysis result for SHA-256 850f925b093eff52…

MALICIOUS

PDF

47.7 KB Created: 2020-08-05 01:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbcf4a57fc8a74eaf4f887846983f853 SHA-1: 2cfb3338b70cfcfeb0017f29252878438070cd03 SHA-256: 850f925b093eff52f2172790f162c8a9029a21cc9c32341830a097765722854b
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=joindre+des+doc+pdf'. The document body also contains this URL and numerous other links, many hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent, likely to redirect users to a phishing or malware distribution 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.ru/pify?keyword=joindre+des+doc+pdf
    • http://files.sexualityintheolderadult.net/uploads/1/3/0/7/130775825/d4e2ada0.pdf
    • http://files.japanesechinclubofcanada.com/uploads/1/3/1/3/131379246/9569f1e.pdf
    • http://files.indianlakechurch.org/uploads/1/3/1/3/131382590/ratosiwuralaxoroseb.pdf
    • http://files.thestagecraftagency.com/uploads/1/3/1/4/131454850/7762037.pdf
    • http://files.iccsprogram.org/uploads/1/3/1/8/131856516/febetexefefom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/9544/7970/files/78424624352.pdf
    • https://cdn.shopify.com/s/files/1/0431/9582/6336/files/golagopugabu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/27674277035.pdf
    • https://cdn.shopify.com/s/files/1/0428/6598/3655/files/84224639591.pdf
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/very_short_adventure_stories_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0433/0645/1094/files/82077678050.pdf
    • https://cdn.shopify.com/s/files/1/0430/7720/6165/files/rofixokefaletor.pdf
    • https://cdn.shopify.com/s/files/1/0430/3332/9817/files/42644147395.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/mibijotovuwezaraxiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/47164858353.pdf
    • https://cdn.shopify.com/s/files/1/0433/2643/9582/files/best_romance_novels_2020.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_off00007a54.bin
5204a2f78827975c2e3895314bc57ce021c9b19c50cc0891213d03a8bff305d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A54 4896 bytes
font_01_sfnt_off00008b13.bin
1a78b383b8cba7ff7cebff6f973008ef29a12c26cd05d4d0d69ef92c92346375		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B13 11928 bytes

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