Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16e72f6d4e94b62…

MALICIOUS

PDF

34.6 KB Created: 2020-09-01 10:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bb1ff1ddab0b58082a1fcf03232c55d SHA-1: 6da9f415166b2eafe05ba44f6532c6cd0814b929 SHA-256: f16e72f6d4e94b622bdb72960adad0154df4042766e378a5052034ce6af4f613
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.link/wix?keyword=certificate+border+png'. This link is presented within the document body, likely as a lure to trick the user into clicking it. The file also contains a large number of embedded PDF links, many hosted on cdn.shopify.com, suggesting a link farm or SEO poisoning tactic. The primary malicious IOC is the redirector URL, which is designed to lead users to malicious content.

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=certificate+border+png
    • https://cdn.shopify.com/s/files/1/0431/2740/6746/files/sasefovetona.pdf
    • https://cdn.shopify.com/s/files/1/0434/6262/3397/files/ashurst_wood_primary_school_uniform.pdf
    • https://cdn.shopify.com/s/files/1/0462/7372/4576/files/2806073271.pdf
    • https://cdn.shopify.com/s/files/1/0435/5584/8355/files/best_free_search_engine_apps_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/40498901325.pdf
    • https://static.usrfiles.com/ugd/b8c837_61a8fd9d557f4068bb5e783080b20db6.pdf
    • https://static.usrfiles.com/ugd/f4de5e_7550b0fd507441e1bbcdcb6f69bb1302.pdf
    • https://static.usrfiles.com/ugd/0ebc1f_a928521bf79047a6bd873d399348ab92.pdf
    • https://static.usrfiles.com/ugd/fb5067_8fe309728a944c5a80fc2141d6932033.pdf
    • https://static.usrfiles.com/ugd/b8c837_e9692c5ec4d749f985635b33a0c3d8dc.pdf
    • https://cdn.shopify.com/s/files/1/0440/8262/6710/files/overlapping_triangles_proofs_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0440/3943/8486/files/69203411744.pdf
    • https://cdn.shopify.com/s/files/1/0431/6495/8879/files/14144696305.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4630/files/89873356508.pdf
    • https://cdn.shopify.com/s/files/1/0457/4923/9964/files/von_android_auf_samsung_tv_streamen.pdf
    • https://cdn.shopify.com/s/files/1/0432/5264/6050/files/98243230410.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_off00004ba3.bin
ab1dc15576e0967cbde9f2b23657538c71ee5e6f8510301e79e44f80ebb1a2c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BA3 5156 bytes
font_01_sfnt_off00005d32.bin
678d31b574434bab1994a25cffdc1dc645275bcfe066af1acab40decce0d5dc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D32 9504 bytes

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