Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c72bf77853cc5d…

MALICIOUS

PDF

42.2 KB Created: 2020-08-21 23:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b4c5e2bcb91c6b26002ff8744d7578e SHA-1: 3c581d39a4f3111fd109c6b591aca3e8875d748a SHA-256: f9c72bf77853cc5d39e41a3cb5c71a7277c7184e0f8d90699355880d8688b920
150 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious infrastructure, specifically a link farm designed to host numerous PDF files. The primary malicious URL identified is https://ttraff.ru/pify?keyword=manualidades+de+papel+reciclado+faciles. This suggests a social engineering tactic to drive traffic to potentially malicious or unwanted content, masquerading as a craft tutorial. The ML classifier strongly supports the malicious nature of this PDF.

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=manualidades+de+papel+reciclado+faciles
    • http://tajekekol.eclecticjewelrydesigns.com/uploads/1/3/1/3/131380181/451893.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2290/files/britannica_encyclopedia_2020.pdf
    • https://cdn.shopify.com/s/files/1/0440/0345/9230/files/cosmic_gate_fire_wire.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/62229260666.pdf
    • https://cdn.shopify.com/s/files/1/0431/7151/2480/files/7129958578.pdf
    • https://cdn.shopify.com/s/files/1/0429/2925/8649/files/lobirazopoxoxebiki.pdf
    • https://cdn.shopify.com/s/files/1/0428/6647/5174/files/lenizadajupitenetorupo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4829/files/67529253601.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/developing_crm_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1797/files/danexixewadijeme.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5261/files/80970325789.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5183/files/kuxul.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/weekly_timesheet_calculator_uk.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_off000064b3.bin
a233c6f8754111fb6c45e58d48a87699737a4a9110ec027b051f3605399ea259		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B3 5156 bytes
font_01_sfnt_off00007648.bin
1e11efe83b3141728b700a1707ff6e8eb9cb4d6d92f6eb98e6ad9773cb55a2b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7648 11036 bytes

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