Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2291cd6571e91a…

MALICIOUS

PDF

43.6 KB Created: 2020-08-14 19:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fe9d9c7fe7a28f8a321abf18020915b SHA-1: 7b86b9560cb0be4d7e54df270b2c75692c182fcc SHA-256: aa2291cd6571e91ab908f3ab7e8c0ec13ebd63e126124393b7d1c8582050e975
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'employee resignation letter format pdf' and a URL that appears to be part of a link farm designed for SEO manipulation. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of 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=employee+resignation+letter+format+pdf
    • http://sisukupi.bymarywong.com/uploads/1/3/0/8/130874633/radamo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/avery_labels_template_18660.pdf
    • https://cdn.shopify.com/s/files/1/0430/5797/1354/files/bujibatagi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5770/9210/files/26274150448.pdf
    • https://cdn.shopify.com/s/files/1/0437/2296/5160/files/90352338452.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12509012650.pdf
    • https://cdn.shopify.com/s/files/1/0436/8728/0790/files/popatonaxawupe.pdf
    • https://cdn.shopify.com/s/files/1/0430/3929/3589/files/siziketatilosa.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0072/files/70822978504.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/54591696127.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/lesokuxejijopimojis.pdf
    • https://cdn.shopify.com/s/files/1/0435/0862/9663/files/73486287512.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_off00006d29.bin
b1c5eeeb80d78005b7b8f463241c418256910bc3359f76774d9d02eadfe11a59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D29 5420 bytes
font_01_sfnt_off00007f8a.bin
663848b0bd8e0bdcd27fce233bbbce3e67133b8a484737b1a7c9f9586592a959		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F8A 10004 bytes

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