Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e08baba4782f276…

MALICIOUS

PDF

54.8 KB Created: 2020-08-12 08:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09a98be1e1c7e572b432d49d46bee04e SHA-1: f642b3a78e9893a496aac2b78c68d1a0f6014271 SHA-256: 5e08baba4782f276b4ec856fad07eead0457f3aabb052565d85a93a023683d27
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.com/wb?keyword=redigere%20pdf%20filer%20online', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the lure.

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=redigere%20pdf%20filer%20online
    • http://nukowaz.canadianclubofedmonton.com/uploads/1/3/1/0/131070711/xejimuwil.pdf
    • http://files.guadalupemed.com/uploads/1/3/0/9/130969481/kubimunexiladupab.pdf
    • http://files.danielandnatasha.info/uploads/1/3/0/7/130775229/zowadotevemojego.pdf
    • http://tafelim.capitalcitybev.com/uploads/1/3/1/4/131408899/2448034.pdf
    • http://mababesu.robertmizzi.com/uploads/1/3/0/7/130776299/3000893.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/vomanimixilorek.pdf
    • https://cdn.shopify.com/s/files/1/0431/4287/3245/files/chi_franciscan_webapp.pdf
    • https://cdn.shopify.com/s/files/1/0437/6104/1569/files/jufufobug.pdf
    • https://cdn.shopify.com/s/files/1/0432/8439/8244/files/lewakovud.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9199/files/xevukesirobetebi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8699/4855/files/library_scrip_wow_classic.pdf
    • https://cdn.shopify.com/s/files/1/0435/3720/3364/files/16258703311.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/nike_mission_statement.pdf
    • https://cdn.shopify.com/s/files/1/0436/2508/7138/files/xodobiwupigededewuvudosa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/how_to_mass_delete_messages_on_discord.pdf
    • https://cdn.shopify.com/s/files/1/0431/4660/8794/files/wikokosinupapivaxinuwitav.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_off000087a3.bin
806a5682583a0dd43956828b072d826da62cc6537f62a90d239d7742a69d3aae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87A3 4828 bytes
font_01_sfnt_off00009825.bin
4add3510d9ae946ac8f936d140be8fc6e2da4c71909f62bf0bf6cb4ebfd63171		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9825 17032 bytes

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