Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd89043ecee92a9…

MALICIOUS

PDF

42.9 KB Created: 2020-09-04 07:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 656861bbedfccc0ffaf6ee07bd23fe0a SHA-1: 9b5ced1e61df0cbfe99746dca9f3e955ca766da2 SHA-256: 4fd89043ecee92a998b9d4a1a22d9aad81dd3612cf5b5a3a480f1382d81b3b58
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL designed to lure users with a fake ringtone prompt. It also contains a PDF link farm heuristic, indicating a large number of external links, many of which are benign but likely serve to obscure the malicious one. The primary malicious URL is https://ttraff.link/wix?keyword=your+mom+calling+ringtone, which is the most critical IOC.

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.link/wix?keyword=your+mom+calling+ringtone
    • https://cdn.shopify.com/s/files/1/0464/7711/5544/files/graduation_card_template_microsoft_word.pdf
    • https://cdn.shopify.com/s/files/1/0431/2042/7157/files/gaxanerajomalixawafuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/7469/8912/files/serenade_melody_bober_sheet_music.pdf
    • https://static.usrfiles.com/ugd/08e331_d6cce7c570594334ab6ba563f8b3a548.pdf
    • https://static.usrfiles.com/ugd/b8c837_d35862a6fabe4deaa45b4555f8f02bd8.pdf
    • https://static.usrfiles.com/ugd/bf0735_ecf0bd2753bd430193cc6a9b4c4b189c.pdf
    • https://static.usrfiles.com/ugd/89064d_3405d0773ad4457598cc3cb471603229.pdf
    • https://static.usrfiles.com/ugd/a44510_c1ab5f99bb584e7a9971f960feeb2f4c.pdf
    • https://static.usrfiles.com/ugd/9b5f63_7614c159500b47cab2aa7e35328456d9.pdf
    • https://static.usrfiles.com/ugd/bdc04d_4dff346942a042e9a2529e01b6b6a7e9.pdf
    • https://static.usrfiles.com/ugd/97aff7_3341caa7a2dd4b9db3b491b2f7e2c12d.pdf
    • https://static.usrfiles.com/ugd/493135_ad83894e73ce42b98345b30f701d69b2.pdf
    • https://static.usrfiles.com/ugd/299074_b33a7801eddb434f9a75f43eb7b9241b.pdf
    • https://static.usrfiles.com/ugd/ee9d3f_de49b29ed8e54aefbdc2d80cb0b7c1e3.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_dd7472250c644e98bcdb272cf2e078c7.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_off00006bb5.bin
4025cee91c4a1dec88f81c34a96220eb5ccce8678aab175ca69f6fadbc29fad0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB5 4904 bytes
font_01_sfnt_off00007c4a.bin
4294388d6cc09a75981811447c2a7e3b670b80b998af9fffc64176cea040e901		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C4A 10112 bytes

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