Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5aabdd6ece4bbd9…

MALICIOUS

PDF

50.3 KB Created: 2020-07-31 07:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88a4dd3d7b6b2e0bd57d73842eb5e912 SHA-1: b9b70f75cd0e7fc63ac7773fcc4ec183c1cfd626 SHA-256: c5aabdd6ece4bbd97f2f26a96a10eac85171954843a87c5dd9266ede3efbce8d
120 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'data structure and algorithm multiple choice questions', suggesting a lure to disguise the malicious intent. The primary malicious IOC is the redirector URL.

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=data+structure+and+algorithm+multiple+choice+questions+with+answers+pdf
    • http://files.aoo1933.com/uploads/1/3/1/1/131164095/bizajali_wiruwumuvi_karugubarelori_bebarufedideta.pdf
    • http://files.harmonyriproducts.com/uploads/1/3/0/9/130969433/vutokukibefujowe.pdf
    • http://files.johntoohey.net/uploads/1/3/1/0/131070581/rivomixipakaviz-runokoraputuji.pdf
    • http://files.ballmania.com/uploads/1/3/1/4/131437655/kakoxoxafin_buwopodikeku_jitinuto.pdf
    • http://files.johntoohey.n
    • https://cdn.shopify.com/s/files/1/0431/6302/5567/files/25893722916.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/piwexodafifikuperibonibol.pdf
    • https://cdn.shopify.com/s/files/1/0433/6012/5080/files/43360499579.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tikodizexosuva.pdf
    • https://cdn.shopify.com/s/files/1/0435/4634/5640/files/75654213657.pdf
    • https://cdn.shopify.com/s/files/1/0440/8039/8486/files/jidametipibevugus.pdf
    • https://cdn.shopify.com/s/files/1/0431/4185/7448/files/tevokabafukebirudakajo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4490/4855/files/70942986450.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7207/files/roguzitepowizibutepo.pdf
    • https://cdn.shopify.com/s/files/1/0438/3296/7318/files/59001585922.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ccf.bin
2fa71dc1bae2d2a1eb1040ae85c7822156434b1855620f5bfabec1c9f0c39beb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CCF 5668 bytes
font_01_sfnt_off00008fe7.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE7 1800 bytes
font_02_sfnt_off00009875.bin
fe19a806c2972146296418dd204e3f7630b599775e954ada5a26e1f5d08238f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9875 10128 bytes

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