Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f94f74a47b1889e…

MALICIOUS

PDF

42.8 KB Created: 2020-07-10 04:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01c8b6581722d54e065913c5ef92fdbb SHA-1: d9d59252f53029a26def8a8ea8ef18a3f0c6691e SHA-256: 0f94f74a47b1889e9e05dcb0fceade2a2f78a5feffaa0d00cdc152ab3ac6ea83
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, identified as a link farm, and one URL points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. This suggests the document's primary purpose is to redirect users to potentially harmful websites, possibly for SEO spam or malware distribution.

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/wb?keyword=nothing%20gold%20can%20stay%20poem%20worksheet
    • http://files.gunengraverdwharris.com/uploads/1/3/0/8/130815124/wekelaj.pdf
    • http://files.abcservicesllc.com/uploads/1/3/1/3/131379546/tojivomizu.pdf
    • http://files.finallylivingthedream.com/uploads/1/3/2/3/132303329/rasaje.pdf
    • http://files.suffolksingers.co.uk/uploads/1/3/0/7/130776176/8692095.pdf
    • http://files.quaystreetstudios.com/uploads/1/3/1/1/131164419/rimoki_lisasa_lefefasemalu_pisupaxugove.pdf
    • http://files.whasociety.org/uploads/1/3/1/4/131410485/warupefudopazureteg.pdf
    • http://files.thevirginiacotillion.com/uploads/1/3/0/8/130814984/5512284.pdf
    • http://files.amritaedt.com/uploads/1/3/2/3/132302868/998425.pdf
    • http://files.rangerschoolofdance.com/uploads/1/3/1/8/131857338/3454696.pdf
    • http://files.airwreckkazillion.com/uploads/1/3/2/6/132696285/464309.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fotebug.files.wordpress.com/2020/07/66693472788.pdf
    • https://demowizo.files.wordpress.com/2020/07/fijegowakifigukarixajavi.pdf
    • https://fevonag.files.wordpress.com/2020/07/58626691607.pdf
    • https://boduregure.files.wordpress.com/2020/06/tovebexaxim.pdf
    • https://tezutije.files.wordpress.com/2020/07/widudexovexosi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/polonafebomi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wizivudid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nagexonulelaxefirulilona.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006935.bin
5f6cbf1af662c3f7c26aa3114442657a9d46d8cae9ba6fa725059695459c7b72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6935 5500 bytes
font_01_sfnt_off00007bd2.bin
55089e0fcea30c2ec9ae21031c203fee61512e101bd68824d01c6646aebbcdd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD2 10088 bytes

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