Malicious PDF — malware analysis report

Static analysis result for SHA-256 08905c96756c237b…

MALICIOUS

PDF

52.6 KB Created: 2020-08-08 08:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58a00a4092cc5fc9537837e2ced0ef8e SHA-1: d972be510f2beed732f5545468bd55e0f6930569 SHA-256: 08905c96756c237b30abffb0195aae5aed0043a2db2942e02bbf55858e30975d
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 benign Shopify URLs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure related to 'capitalismo y comunismo pdf'. 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=capitalismo+y+comunismo+pdf
    • http://files.bridgewaterdairy.com/uploads/1/3/2/6/132695714/26b90.pdf
    • http://files.ozarkfamilyoperacompany.com/uploads/1/3/2/6/132681969/2650986.pdf
    • http://files.lafayetteschoolrestoration.com/uploads/1/3/1/3/131398357/nutuva.pdf
    • http://files.lizcolter.com/uploads/1/3/1/8/131856815/xugofugerajep-vusos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5702/8001/files/gamebanana_tf2_huds.pdf
    • https://cdn.shopify.com/s/files/1/0435/5509/4677/files/62061370699.pdf
    • https://cdn.shopify.com/s/files/1/0430/0357/6481/files/puff_dady_ill_be_missing_you_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/tonipuvej.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/moloku.pdf
    • https://cdn.shopify.com/s/files/1/0434/8330/0005/files/93830901836.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9232/files/58453214469.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3453/files/managing_barriers_to_creativity_and_innovation.pdf
    • https://cdn.shopify.com/s/files/1/0430/6056/0021/files/51832034871.pdf
    • https://cdn.shopify.com/s/files/1/0431/9808/7328/files/tedekixisinaxetikikugudus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/risk_management_in_software_testing.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1164/files/sexiriwanefomagu.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_off00008cdc.bin
91ef54ea9a43a0b25ba42c4f7f7e4418e24018da8ea2af00041b75148ca4a1b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CDC 5212 bytes
font_01_sfnt_off00009e90.bin
f12bdf2a0827300ec7d609b6c161f2a241dfca19c0485f60184a670d63382c8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E90 11516 bytes

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