Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c4a91f28f1e406…

MALICIOUS

PDF

38.2 KB Created: 2020-08-13 00:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 022b324c9761ecc8fb35f84fabbddd23 SHA-1: 564b584326993384a98293ade0f771277d9c74e3 SHA-256: c1c4a91f28f1e4067a2f8b4175db659e0da02cfb5aa3131befedf560bd8d8bb8
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. The document body, though partially corrupted, contains text related to 'cheque book request form pdf' and includes the malicious URL. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains, likely for SEO manipulation or to obscure the malicious redirector. The primary malicious IOC is the ttraff.ru URL, which serves as the initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/wb?keyword=cheque%20book%20request%20form%20pdf
    • http://files.blueridgeperformingarts.com/uploads/1/3/1/4/131453065/ziwifurizibogimimexa.pdf
    • http://files.freedomdayusa.com/uploads/1/3/0/7/130776629/6241389.pdf
    • http://dadobag.vacationsbyreba.com/uploads/1/3/2/6/132680813/dfdfa3cc38.pdf
    • http://files.jake-schick.com/uploads/1/3/1/4/131453595/0c78f.pdf
    • http://dajite.stpetelimoservice.com/uploads/1/3/1/8/131856374/604142.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9482/files/petepokigofenula.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/15774231622.pdf
    • https://cdn.shopify.com/s/files/1/0432/5684/0354/files/autopage_xt_43lcd_operation_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/5095/6960/files/kelly_rowland_kisses_down_low.pdf
    • https://cdn.shopify.com/s/files/1/0436/2177/7570/files/46606305299.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jivanup.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4182/files/bipeludedo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3417/3859/files/33049850925.pdf
    • https://cdn.shopify.com/s/files/1/0435/7105/2703/files/jujorelufonubevedanu.pdf
    • https://cdn.shopify.com/s/files/1/0451/1324/5848/files/95337252074.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_off000057aa.bin
391eec9129e5e618abe497b645713d3fa0cddfc9e742e087b0b06e334e15ecd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57AA 5272 bytes
font_01_sfnt_off0000696a.bin
4e0a7fd07d6f1b2d332bebcb9bf255d5d20d5adc66688fa6cff8ae46e23a7d77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x696A 10212 bytes

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