Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f8c6db62ecab72…

MALICIOUS

PDF

38.9 KB Created: 2020-08-28 13:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99952efbc3875bb1c20d94d5547c002b SHA-1: 6b1a437e50ff98d559f32624b1680aa7cb2b0240 SHA-256: 09f8c6db62ecab72b44bd361bf6988c792e81212318e92837fec630dd33e6dc2
154 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to malicious infrastructure, specifically a URL related to a 'delonghi nespresso machine instructions' keyword. The heuristic firings indicate this is a malicious redirector and part of a link farm, suggesting a phishing or scam attempt. While no scripts were extracted, the presence of malicious links within the document body points towards a social engineering attack designed to lure users to harmful sites.

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=delonghi+nespresso+machine+instructions
    • http://wofirow.cassinsackett.com/uploads/1/3/2/7/132741555/ae5f7f14e326.pdf
    • http://bubozisa.thymesquareweddingsandparties.com/uploads/1/3/1/4/131407995/saxuvipek.pdf
    • http://files.theautismhelpgroup.com/uploads/1/3/1/4/131437535/7579288.pdf
    • http://files.denmarkatvclub.org/uploads/1/3/2/6/132681586/d0c8bc570bf7f.pdf
    • http://files.sueglass.com/uploads/1/3/2/6/132681322/017ff7c6afe6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3684/3933/files/resegojekukel.pdf
    • https://cdn.shopify.com/s/files/1/0434/5105/6295/files/dj_terbaru_2019_senorita_x_zombie.pdf
    • https://cdn.shopify.com/s/files/1/0462/9882/4864/files/clash_of_clans_october_update_apk.pdf
    • https://cdn.shopify.com/s/files/1/0429/6382/8895/files/88071428683.pdf
    • https://cdn.shopify.com/s/files/1/0432/4445/4056/files/gajeperusofuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/8342/3128/files/lemuvavepezifusofudobexox.pdf
    • https://cdn.shopify.com/s/files/1/0435/7442/7806/files/99708912782.pdf
    • https://cdn.shopify.com/s/files/1/0433/0556/6366/files/45015254487.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/4142289632.pdf
    • https://cdn.shopify.com/s/files/1/0436/9897/8971/files/11779063950.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1507/files/zhu_faded_mp._3.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_off00005a02.bin
ec690f495ce464a9430cd551661930e385979a3b383425f8b07ec142a6e6eccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A02 5344 bytes
font_01_sfnt_off00006c0c.bin
09d335d350f148e5bd43d0baf32929654f4b971c18a84204135f85be59934dab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C0C 10116 bytes

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