Malicious PDF — malware analysis report

Static analysis result for SHA-256 82091eea8f3c9fcb…

MALICIOUS

PDF

44.0 KB Created: 2020-08-11 18:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a63095e8c0df517e06e9d57e8d60a111 SHA-1: 5a9b7ca80a0c93124678d012cc8693af10ed5802 SHA-256: 82091eea8f3c9fcb6e5acf61e7af6cd22a12b633ec8f5de80a0a026df548eaa0
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=python+data+analysis+projects+pdf, which is part of a link farm strategy. The document body is heavily obfuscated but contains references to the malicious URL and benign-looking Shopify URLs, suggesting a lure to disguise malicious activity. The ML classifier strongly indicates maliciousness.

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/pify?keyword=python+data+analysis+projects+pdf
    • http://files.buysellbell.com/uploads/1/3/1/3/131379034/1451508.pdf
    • http://files.gourmetdessert.co.uk/uploads/1/3/2/6/132696214/ludajuwofaluse.pdf
    • http://files.shopstvm.com/uploads/1/3/1/4/131412290/junimosepa_sosotoriwivigav_zijaxazib.pdf
    • https://cdn.shopify.com/s/files/1/0433/3839/9912/files/tigakikufafinifogakagava.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75904593322.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/92906575536.pdf
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/51489072885.pdf
    • https://cdn.shopify.com/s/files/1/0428/0667/3575/files/probability_sampling_in_quantitative_research.pdf
    • https://cdn.shopify.com/s/files/1/0434/0819/5738/files/ielts_writing_task_1_band_9_pie_chart.pdf
    • https://cdn.shopify.com/s/files/1/0428/5680/8607/files/buwigonuberelu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5907/files/60965185963.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3794/files/brighter_pipboy_light_v1.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/15309222551.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_off00006e34.bin
65ad2333f0f5ab19976752b7c380497101c36042ff2746d40f5ea3902ae6fc37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E34 5420 bytes
font_01_sfnt_off000080a3.bin
0d5dae9b1544014caa7cc340264ef13baef286b112a7089f52e4cf529d5a0bf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80A3 10144 bytes

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