Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50f0ec48a5e6b14…

MALICIOUS

PDF

66.1 KB Created: 2020-08-02 02:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8e7e1399c3cfca52d4194143c1a3949 SHA-1: 311056b0d57c4e0683b91289de0a5513403f9cdb SHA-256: b50f0ec48a5e6b1444606b093586d21d7db5f3b1ed707d3d7aeac680c34bb302
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=fetch+async+await'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one to 'https://cdn.shopify.com/s/files/1/0434/0622/9654/files/vosolivalilaxiwefopupuv.pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, reinforcing the redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.com/pify?keyword=fetch+async+await
    • http://files.bookhivebeerclub.com/uploads/1/3/1/4/131406861/tedagugalulasadu.pdf
    • http://files.3dpd.co.za/uploads/1/3/1/4/131406835/pexevek.pdf
    • http://files.jennyshepherdphotography.com/uploads/1/3/0/8/130814682/e6f3c54.pdf
    • http://files.medicalequipmentcorp.com/uploads/1/3/1/3/131380756/2898562.pdf
    • http://files.thesmesupportdirector.com/uploads/1/3/0/8/130814238/bajiravox.pdf
    • https://cdn.shopify.com/s/files/1/0434/0622/9654/files/vosolivalilaxiwefopupuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/9961/1553/files/90407984390.pdf
    • https://cdn.shopify.com/s/files/1/0433/7732/8278/files/sugusom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50537202024.pdf
    • https://cdn.shopify.com/s/files/1/0437/7296/9109/files/spin_selling.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/wajulolivalajorefevipewas.pdf
    • https://cdn.shopify.com/s/files/1/0435/1619/9064/files/tinigapuzatovufi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/rafamoratij.pdf
    • https://cdn.shopify.com/s/files/1/0440/6326/0822/files/ferixufo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9760/files/nikoxakoxixavonaba.pdf
    • https://cdn.shopify.com/s/files/1/0437/3217/2965/files/busidigo.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/
    • https://cdn.shopify.com/s/files/1/0440/6326/0822/files/ferix

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000089a5.bin
f9b2e35f984cdfacaddab27bd31b5baee4e5204345d523a9c19a9837a45f0506		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A5 15320 bytes
font_01_sfnt_off0000ba96.bin
e2f2ef2c3d4b1dab0af72e812fd3cae677fe42b541df03523344a10cda5bd573		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA96 4908 bytes
font_02_sfnt_off0000cb65.bin
f932642f6025ad8877e4d52f05a2015eff4c348d112ca832f4370c1b3b29b3c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB65 14288 bytes

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