Malicious PDF — malware analysis report

Static analysis result for SHA-256 44771149d7b756bf…

MALICIOUS

PDF

42.6 KB Created: 2020-08-21 05:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bda1235d905b5131ade74d00ae1a1359 SHA-1: a0f98e44b37739fd40fda9340abe701fa05a5792 SHA-256: 44771149d7b756bf85fefc187ee6fba0a27fa6e0b62d22199941278d78a3bb80
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'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The embedded document text, though heavily obfuscated, contains the primary malicious URL, suggesting the document's purpose is to lure users to this external resource.

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=family+conflict+worksheets
    • http://dases.shefaholistic.com/uploads/1/3/2/6/132695328/aedf3.pdf
    • https://cdn.shopify.com/s/files/1/0435/1868/9432/files/topotezepekuren.pdf
    • https://cdn.shopify.com/s/files/1/0431/3242/0264/files/17126885501.pdf
    • https://cdn.shopify.com/s/files/1/0438/2294/0320/files/arizona_learner_s_permit_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/4501/1112/files/the_exorcist_tv_show_episode_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/7573/8527/files/jibesufez.pdf
    • https://cdn.shopify.com/s/files/1/0433/6284/4837/files/add_page_break_in_jspdf.pdf
    • https://cdn.shopify.com/s/files/1/0440/4019/2150/files/filariasis_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0435/5453/7624/files/sql_server_2020_tutorial_point.pdf
    • https://cdn.shopify.com/s/files/1/0429/2195/1391/files/monster_manual_iii.pdf
    • https://cdn.shopify.com/s/files/1/0429/5743/9129/files/zigif.pdf
    • https://cdn.shopify.com/s/files/1/0438/2215/3890/files/23467787692.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/21228944423.pdf
    • https://cdn.shopify.com/s/files/1/0434/0416/5285/files/27971482188.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/
    • https://cdn.shopify.com/s/files/1/0435/5453/7624/files/sql_ser

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067f1.bin
11d2230fc248742004e4286519fa34b1a16f429f02ee5912ee9f4ccc94d8c0c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67F1 5332 bytes
font_01_sfnt_off000079ff.bin
883fedbc2cb9a910c436271d3df95003666072e7ea01d78ef21deda1952ed38b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79FF 10364 bytes

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