Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8b9ddfc72c185a…

MALICIOUS

PDF

42.3 KB Created: 2020-08-09 00:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59a3ee2deeed87361877b0b594e1aad8 SHA-1: de638598891bbb6da925908a5ec3701d56cbaaaf SHA-256: 3b8b9ddfc72c185a72cfb035981fdd65fd683d767c2ad99b5b17a67d4f7a4db4
120 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 the same URL as the malicious redirector, suggesting an attempt to disguise the malicious link. The presence of a link farm further indicates an effort to distribute malicious content.

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=public+finance+management+system+pdf
    • http://files.baguanyc.com/uploads/1/3/1/3/131381237/60f1f.pdf
    • http://rujorib.authornicoleedwards.com/uploads/1/3/2/3/132303382/zovisisepag.pdf
    • http://files.lsttclub.org/uploads/1/3/1/1/131164424/8876721.pdf
    • https://cdn.shopify.com/s/files/1/0430/8841/2836/files/fapunedimusategozi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4246/4163/files/38844152751.pdf
    • https://cdn.shopify.com/s/files/1/0429/2545/7575/files/naming_aldehydes_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/25938015374.pdf
    • https://cdn.shopify.com/s/files/1/0434/6321/3209/files/cadette_outdoor_journey.pdf
    • https://cdn.shopify.com/s/files/1/0439/3913/5643/files/fusuwolopebenisiniruz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0202/files/sefugifixowaxediwamapezev.pdf
    • https://cdn.shopify.com/s/files/1/0432/1722/3840/files/wix_oil_filter_cross_reference.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/20641569633.pdf
    • https://cdn.shopify.com/s/files/1/0432/6411/4843/files/30902969857.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/serie_a_calendario_julho_download.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_off000065c8.bin
ec555d92543dd5564bb560edab89471970431a0c4897cbfc6f0eb1356414c67f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C8 5620 bytes
font_01_sfnt_off000078e0.bin
3b10271d1d9bde3d9178fb419a221b1c6288b4bd6af374d63955aa598b37e515		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78E0 10336 bytes

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