Malicious PDF — malware analysis report

Static analysis result for SHA-256 25481bb425a24801…

MALICIOUS

PDF

39.9 KB Created: 2020-09-19 08:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff8c54b5d98b205858f514ef03dbe740 SHA-1: 08f58dd9be59f7b71fcbcc1b5f7963ee3a23ee35 SHA-256: 25481bb425a248013e96b2da622373d9e2a9f9c6efb7c77c30d3cf5ce88581cc
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=generating+quadratic+sequences+worksheet'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify domains. The document body, though heavily obfuscated, contains the malicious URL and references to educational materials, suggesting a lure to a malicious site disguised as a worksheet. No scripts were extracted from this sample.

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=generating+quadratic+sequences+worksheet
    • http://files.kamafittv.com/uploads/1/3/1/4/131482819/f523388c2e.pdf
    • http://xifebi.mindspringhempco.com/uploads/1/3/1/0/131070858/b69b0a202.pdf
    • https://cdn.shopify.com/s/files/1/0434/1995/9463/files/austenite_transformation_to_martensite.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/iatf_16949_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0432/1827/2417/files/86157522710.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5395/files/pubujewugirubuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/0826/1285/files/pifonokaridopep.pdf
    • https://c79b6311-7e37-4ca1-84f0-2667f938a843.filesusr.com/ugd/4dd980_1ab46a0dc3964f7fb7f3e511273a8b72.pdf?index=true
    • https://a28b22fb-762d-4952-aede-d008f659122e.filesusr.com/ugd/a4c1fa_b49f7a53613146959b90751409bf2709.pdf?index=true
    • https://188d3871-fbc7-4f09-a428-58ff1a33f26a.filesusr.com/ugd/6f5f23_1e9ef3512ad5466ebd21a53687a77360.pdf?index=true
    • https://9f810cf7-2b34-4648-a8ef-4d3830ea9860.filesusr.com/ugd/1f6d71_169591fe98424f35925ec8525aab0eff.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0432/3514/7933/files/zurajaguwex.pdf
    • https://cdn.shopify.com/s/files/1/0438/3014/9270/files/comparison_of_adjectives_exercises_upper_intermediate.pdf
    • https://cdn.shopify.com/s/files/1/0433/8489/7692/files/lizilonewatesuja.pdf
    • https://cdn.shopify.com/s/files/1/0428/1961/6935/files/biosensors_international_group_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0464/3074/8824/files/dezebozavikoludiw.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_off00005d2a.bin
4a668b95c97d24d39289e68b3cb6d7e543957cc53a076590275b71409f7dad03
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2A 5484 bytes
font_01_sfnt_off00006fd6.bin
f547dd080dabe5fb1364aaef51323d7bb7ac70a97f220c1fc5f8b4595ae9abef
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD6 10288 bytes