Malicious PDF — malware analysis report

Static analysis result for SHA-256 f909cbb1ffe6083b…

MALICIOUS

PDF

40.1 KB Created: 2020-08-12 15:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bfb1de44431363dd342a8b06cb0a5d9 SHA-1: 858fb0a8cfaf5938bdc91b47ff2de4fa7a79f157 SHA-256: f909cbb1ffe6083b3f2e0a0d44a687dea49d3b0e357f7216348b528bcf48e882
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a worksheet. This indicates a likely phishing or malware distribution attempt. The PDF also contains a large number of external links, many pointing to Shopify domains, which is characteristic of SEO link farm abuse to improve search engine ranking for malicious content. No scripts were extracted, but the presence of the malicious redirector and the link farm strategy strongly suggest a malicious intent.

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=multiplying%20and%20dividing%20decimals%20worksheet%20pdf
    • http://xineg.tanasi-sharkfinguitarpicks.com/uploads/1/3/1/3/131398591/bdbdef2.pdf
    • http://wemoravip.mi-sheffield.com/uploads/1/3/1/4/131483337/b741823783b08.pdf
    • http://files.howardssilverlabs.com/uploads/1/3/2/7/132740620/wedugeve.pdf
    • http://files.buggytownbirddogs.com/uploads/1/3/0/7/130775544/nisulozuzorusumug.pdf
    • http://files.beasleydoodles.net/uploads/1/3/1/3/131398547/lasejofadezi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/92923818108.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2680/files/bankruptcy_act_qld.pdf
    • https://cdn.shopify.com/s/files/1/0431/0627/1394/files/71720950252.pdf
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/41036600391.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31906594002.pdf
    • https://cdn.shopify.com/s/files/1/0432/4058/7431/files/todex.pdf
    • https://cdn.shopify.com/s/files/1/0435/7442/7806/files/jefoxolubikabesukukupivi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6978/3720/files/59607308210.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6802/files/carte_du_monde.pdf
    • https://cdn.shopify.com/s/files/1/0437/6697/2577/files/20067635535.pdf
    • https://cdn.shopify.com/s/files/1/0432/9832/4640/files/32585626207.pdf
    • https://cdn.shopify.com/s/files/1/0436/7004/4825/files/unofficial_skyrim_patch.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_off00005dbd.bin
0200155057932251a13b6ee60189dae19477dab0116d22f0d0f507ca0c134ac0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBD 5892 bytes
font_01_sfnt_off000071c0.bin
3ab3cf32adc6fe982475dbd0a947635ec06cee1671615b1423f1cbda81ba43a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x71C0 9792 bytes