Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c158e4bbcc11d03…

MALICIOUS

PDF

52.4 KB Created: 2020-08-24 13:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33084e89076d7598533ef66d2427b073 SHA-1: f4d3cf175b4497ecac7d913d438d6af4849ae610 SHA-256: 0c158e4bbcc11d0353f3c3a01cd93a289c24f9e68de4ec7cd5fab742557766be
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.cc/pify?keyword=sample+application+form+south+korea+visa', is flagged as a malicious redirector. The document body also contains this URL and other links to PDF files, suggesting a link farm or redirection tactic. The ML classifier strongly indicates maliciousness, and the overall structure points to a phishing or redirection attempt.

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=sample+application+form+south+korea+visa
    • http://pexek.ours-winnipeg.com/uploads/1/3/1/4/131453698/bututatageret_jodoginu_lusox.pdf
    • http://jukebud.redeemernewton.com/uploads/1/3/2/6/132683008/paginowevugalap.pdf
    • http://files.candcclaycreations.com/uploads/1/3/0/7/130776183/3099662.pdf
    • http://files.delcocheetahcat.com/uploads/1/3/0/8/130814343/517f99.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5002/2550/files/xinogobulogumofevipubi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4748/files/76198087445.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/59812201688.pdf
    • https://cdn.shopify.com/s/files/1/0435/6676/0095/files/nurawusuzojonopiliman.pdf
    • https://cdn.shopify.com/s/files/1/0435/7862/2115/files/vusili.pdf
    • https://cdn.shopify.com/s/files/1/0427/4506/9724/files/barron_s_gre_math_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/0721/2695/files/70441155633.pdf
    • https://cdn.shopify.com/s/files/1/0427/8157/3279/files/62709708378.pdf
    • https://cdn.shopify.com/s/files/1/0433/2971/6374/files/syllable_structure_exercises_with_answers.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000760f.bin
4999f8266f5554605d69f6b3a11691d55b2eba9a2429f0d04616616883891259		 pdf-font-stream PDF embedded font (sfnt) at offset 0x760F 3592 bytes
font_01_sfnt_off000082d1.bin
f7d32457724e957100859ce1fbf920b6054739d39fd844b79bc94fb0e41ca902		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82D1 5480 bytes
font_02_sfnt_off00009540.bin
9059473c4baf4b2df1d14404b0b0560d5a57f7b82054dcb55b5a5bda586094e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9540 2424 bytes
font_03_sfnt_off00009ec0.bin
a817a8f0f82937fac49238d9f87ab267cbbbd20637303fb861952ed7f8162a47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EC0 10828 bytes

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