Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e47efdcaf64466c…

MALICIOUS

PDF

60.1 KB Created: 2020-08-06 11:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0fc954622286380abb8b5d80369e266 SHA-1: 326b1fc585fc0c357be394d73dc807482fd5ddbf SHA-256: 4e47efdcaf64466cc84aa12440da91fbd1251fb06b281f1d5750738dda420f79
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=api+527+standard+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent. The primary attack pattern involves redirecting the user to a malicious site.

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=api+527+standard+pdf
    • http://files.jeffcofiretraining.org/uploads/1/3/2/6/132681409/4110604.pdf
    • http://files.amandaknight-bardsley.com/uploads/1/3/0/7/130775942/6881359.pdf
    • http://files.carlgroup.org/uploads/1/3/1/3/131398222/3502960.pdf
    • http://files.giltnerlogistics.com/uploads/1/3/1/4/131437044/dijozajobudi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2448/0416/files/lewixiwaxenawusepetavadop.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9675/files/47112166193.pdf
    • https://cdn.shopify.com/s/files/1/0431/2596/4957/files/41959081272.pdf
    • https://cdn.shopify.com/s/files/1/0433/0654/9406/files/pivetugen.pdf
    • https://cdn.shopify.com/s/files/1/0432/5638/1597/files/96850819649.pdf
    • https://cdn.shopify.com/s/files/1/0432/8679/0304/files/bolexajomopivipamudade.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/new_product_adoption_process.pdf
    • https://cdn.shopify.com/s/files/1/0434/9237/6741/files/20016899896.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/bazanofudaxowa.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/godilosomavumuxigareg.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/13441303064.pdf
    • https://cdn.shopify.com/s/files/1/0428/0044/7655/files/wivabapugosewokogeneletol.pdf
    • https://cdn.shopify.com/s/files/1/0432/6175/5547/files/medieval_town_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0439/6960/9886/files/usps_blue_lite.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_off0000a86a.bin
d80fbfd4c88c2d86d21c294f92314a7a44d7fd27d2cbecaa3ac9e0a0a4e42fab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA86A 5328 bytes
font_01_sfnt_off0000baa8.bin
918b8a33e15be496a905ff75e16e7d4ffc027e8f2fed0236bd22d803d0476593		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA8 12852 bytes

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