Malicious PDF — malware analysis report

Static analysis result for SHA-256 637e78cd8f6f7892…

MALICIOUS

PDF

44.6 KB Created: 2020-08-13 06:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd3d80d11496652d4e0a970a6f9ca87b SHA-1: 6d010586cf00a5b583116db86faea0eda3734ab1 SHA-256: 637e78cd8f6f7892497fcd447eb4a78b938dfbe8d9caa5f45aa346f4f462ec0e
162 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. It also presents a lure related to investment definitions, aligning with the SE_INVOICE_LURE heuristic. The ML_NYX_PDF_MALICIOUS classifier strongly suggests malicious intent. The embedded links likely serve to download further malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/wb?keyword=long%20term%20investment%20definition%20pdf
    • http://vilajifun.pjcarradori.com/uploads/1/3/1/1/131164250/tikufironu.pdf
    • http://files.ragmatical.com/uploads/1/3/0/7/130739919/466853.pdf
    • http://files.gracefound.net/uploads/1/3/1/4/131438847/d2bf08.pdf
    • http://files.clearriverredangus.com/uploads/1/3/0/7/130738939/30abab13c0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0862/9659/files/janome_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/benchmark_advance_4th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0432/7460/0598/files/voith_cardan_shaft_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0438/6524/3803/files/lenobapijadunidudi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/fabebebasovi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5301/4423/files/4799302839.pdf
    • https://cdn.shopify.com/s/files/1/0433/6628/5480/files/34988321941.pdf
    • https://cdn.shopify.com/s/files/1/0431/1095/7210/files/bradford_city_stadium_fire.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/wishcraft_barbara_sher_deutsch.pdf
    • https://cdn.shopify.com/s/files/1/0437/2011/4331/files/jezovobibiponetud.pdf
    • https://cdn.shopify.com/s/files/1/0432/2213/9041/files/56150881616.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_off000070a7.bin
0108f1deebd82a0173b32952842a88800c5172d429e351da59f705ee0acd48b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A7 5120 bytes
font_01_sfnt_off00008214.bin
3beec48b21a2f92712230e382be43a9f65c5d68790a15feabacf126925361aa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8214 10472 bytes

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