Malicious PDF — malware analysis report

Static analysis result for SHA-256 941ce2f0da2b898c…

MALICIOUS

PDF

53.0 KB Created: 2020-08-09 03:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce02fea95e5eed643753999a5d5f8f5c SHA-1: b3bf8cee76aba3ab5ec2d72bac9e31c6ae38f088 SHA-256: 941ce2f0da2b898c7a824cfef339accd50be9505f68c71d62a7fd50dedbce480
152 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains, likely as part of a link farm to improve SEO for malicious content. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is also present in the document body. This indicates a phishing or scam attempt using a lure of free educational material.

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=libros+para+aprender+frances+desde+cero+pdf+gratis
    • http://files.readersandleaders.org/uploads/1/3/2/6/132682563/6701058.pdf
    • http://files.hawaiirootsandbranches.com/uploads/1/3/2/6/132695258/lubufozirabijetav.pdf
    • http://files.chimachancreations.com/uploads/1/3/0/7/130775382/2749565.pdf
    • http://files.paeoniapines.com/uploads/1/3/1/4/131406841/gumezekibox_resuri_didodizo.pdf
    • http://files.hallenelaw.com/uploads/1/3/0/8/130815009/4d0e33786d.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/advanced_calculus_folland.pdf
    • https://cdn.shopify.com/s/files/1/0429/6641/7571/files/takokanasilavetevifa.pdf
    • https://cdn.shopify.com/s/files/1/0434/8831/3506/files/nenavutoninedamakew.pdf
    • https://cdn.shopify.com/s/files/1/0437/7352/6178/files/jessi_brianna_nude.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41078692832.pdf
    • https://cdn.shopify.com/s/files/1/0437/6294/2106/files/rizoxopodutexinirefosub.pdf
    • https://cdn.shopify.com/s/files/1/0437/6435/1130/files/valafum.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6666/files/sikonasobuzi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/the_gods_are_bastards.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/anthranilic_acid_synthesis_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0433/6936/5654/files/nh_dmv_forms.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9236/files/12764865205.pdf
    • https://cdn.shopify.com/s/files/1/0431/7675/5349/files/jugagurezenejavorinaj.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_off00008c8e.bin
689af29a17828649b66e9825ad8602cd1904197c5b1d707e589a1c96b2c9c5a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C8E 5372 bytes
font_01_sfnt_off00009ede.bin
92c42bf39c48d5d390579df9eb02369f097fe19a92e4811dffdf12c0dc366f22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EDE 11612 bytes

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