Malicious PDF — malware analysis report

Static analysis result for SHA-256 427c7f831398be15…

MALICIOUS

PDF

47.5 KB Created: 2020-08-24 22:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f6e88a5a5bac3907e09df80c19cb361 SHA-1: 6345fbce050232b576427de7c2bb68c6de1ba332 SHA-256: 427c7f831398be156b0c6a9af46cc39a15fc56a64747a1f9ee8b61eca0a376ca
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors, such as ttraff.com. The document body, though partially obfuscated, mentions 'social media addiction effects on academic performance', likely a lure to disguise the malicious intent. The primary malicious IOC is the ttraff.com redirector URL, which is designed to lead users to further malicious content.

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.com/pify?keyword=social+media+addiction+effects+on+academic+performance
    • http://files.starsandstripesunlimited.com/uploads/1/3/0/7/130739742/peliginexoguxo_kedovo_gubifaxebabomen_patekef.pdf
    • http://files.esibstudentsfront.com/uploads/1/3/2/6/132682171/5836004.pdf
    • http://selenujam.asafcircus.com/uploads/1/3/1/4/131438019/bafifig.pdf
    • http://files.cardiffmetcricket.com/uploads/1/3/0/7/130776257/7410814.pdf
    • https://cdn.shopify.com/s/files/1/0440/9150/6840/files/76402898127.pdf
    • https://cdn.shopify.com/s/files/1/0440/9258/8184/files/cambridge_english_advanced_result_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/exercice_verbe_avoir_et_etre_au_present_ce2.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5031/files/60857168651.pdf
    • https://cdn.shopify.com/s/files/1/0429/6491/0243/files/47767456874.pdf
    • https://cdn.shopify.com/s/files/1/0430/6544/2455/files/xinibumigovalagebesig.pdf
    • https://cdn.shopify.com/s/files/1/0430/9942/2871/files/ensnared_a_g_howard_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0428/3141/3404/files/16456154474.pdf
    • https://cdn.shopify.com/s/files/1/0434/8903/4402/files/46205221994.pdf
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/35470875589.pdf
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/4732581562.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/wirepo.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_off000078e2.bin
2c812475d3011758fc4c75d315a92ddd34c82d3657a43067356dbb2e7b913246
pdf-font-stream PDF embedded font (sfnt) at offset 0x78E2 5404 bytes
font_01_sfnt_off00008b1f.bin
b260652d8a01fe5839d48d8491fdd4fb3f6ccd5fb366689c2efc934c33dc2dca
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1F 10924 bytes