Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe35d99c8f6f841f…

MALICIOUS

PDF

41.2 KB Created: 2020-08-16 21:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a28947b63740eb9368b14b53bacb868 SHA-1: 97bb006ab0b8d4ca672fea19cb6cbd0803d8f0c5 SHA-256: fe35d99c8f6f841f686379483e3078ea2ed0ff14029e74da8517c4eced093b9a
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this malicious URL. The presence of numerous links, many pointing to Shopify domains, suggests an attempt to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=brandy+another+day+in+paradise+remix
    • http://files.melbatheater.org/uploads/1/3/1/3/131380558/8207605.pdf
    • http://files.libbysaylor.com/uploads/1/3/0/7/130739308/dapizenize.pdf
    • http://files.walkerthomasadams.com/uploads/1/3/1/1/131164479/0b63d85af67.pdf
    • http://xomabajom.moorestownlegendslax.com/uploads/1/3/1/3/131398027/luzuk_baromu_vamudanexitir_tajutodod.pdf
    • https://cdn.shopify.com/s/files/1/0437/6795/5610/files/mapilosuxagumoxudanom.pdf
    • https://cdn.shopify.com/s/files/1/0439/5224/2856/files/preposition_of_place_exercise_with_answer.pdf
    • https://cdn.shopify.com/s/files/1/0429/3168/3484/files/56821714759.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9615/files/certificate_of_occupancy_nyc.pdf
    • https://cdn.shopify.com/s/files/1/0428/0428/1511/files/gididitelikimek.pdf
    • https://cdn.shopify.com/s/files/1/0437/1064/4377/files/basic_calculus_formulas.pdf
    • https://cdn.shopify.com/s/files/1/0434/2664/4125/files/45515736083.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/novorubafiwani.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0116/files/pikinabakoxebobote.pdf
    • https://cdn.shopify.com/s/files/1/0428/5097/5910/files/20968575415.pdf
    • https://cdn.shopify.com/s/files/1/0432/5592/2852/files/91485939121.pdf
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/adobe_after_effects_basics.pdf
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/zafedepifol.pdf
    • https://cdn.shopify.com/s/files/1/0440/5886/9910/files/5_categories_of_nonverbal_communication.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000045d2.bin
f3bdf506527690d84699e054b6b0d430cf75f6d71827e854ea26bc219a0c0e34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45D2 5384 bytes
font_01_sfnt_off000057fc.bin
c7199546f5c110a3a7d6aa929df59ac80f3bf4f7623f4c7c09d51dd7edfea03d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57FC 9172 bytes
font_02_sfnt_off000077bf.bin
e58e8e8d3617fa2f52d62469859eb662c26c1c1537dc21f5cc6f1aa71eaa6aed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77BF 18776 bytes

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