Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c0357428f79165…

MALICIOUS

PDF

32.6 KB Created: 2020-08-12 00:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c26e06fd7b7f19c54ba65e5eb21e0ab SHA-1: 38fe45f250f9c6c74ca50678a670b6922542d7e1 SHA-256: 46c0357428f791650cb1aca1fa1fe5c6ac6bdbec771cb195019cf2a8ec244339
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'O level additional mathematics textbook pdf' and includes the malicious URL, suggesting a lure to disguise malicious activity. The primary malicious IOC is the redirector URL, which likely leads to further stages of infection.

Heuristics 3

  • 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.
  • 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=o+level+additional+mathematics+textbook+pdf
    • http://ganetavag.boatinsurance.wales/uploads/1/3/1/4/131454012/9b05db19.pdf
    • http://files.chinchilla3d.com/uploads/1/3/1/4/131438692/1290017.pdf
    • http://javesabun.emma-brooks-design.com/uploads/1/3/0/7/130776791/xigifajegizorag-zelexeforofupi-soxaxoduzomivu-dasewegekex.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/lesejeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9599/9129/files/ruzatuzubizedivu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1334/files/zebabogixuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/28669396322.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/vonigosubuxubamibomujo.pdf
    • https://cdn.shopify.com/s/files/1/0437/5900/9943/files/btec_applied_science_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/gotir.pdf
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/72322179343.pdf
    • https://cdn.shopify.com/s/files/1/0429/2847/2220/files/14299916288.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_off0000435a.bin
ea32b3488c70500285f8d8501e4ac4491755bf18eab4632927c0bfcd62986cdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x435A 5656 bytes
font_01_sfnt_off0000567c.bin
fdaef8263da7d55400369ceb78a91655998543f0f9626580d39ec17f29e75939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x567C 9192 bytes

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