Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f79c2f1b138a6d…

MALICIOUS

PDF

38.0 KB Created: 2020-08-17 11:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c20ecb7272fb52a3f8aa361988eb79d1 SHA-1: 9c70bf165eac16abe007675dc273084091f895f1 SHA-256: 18f79c2f1b138a6d5e96383016a9a7f471822e46fd47e010efa726180c559adf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body and embedded links suggest a lure to trick users into visiting potentially harmful websites, possibly for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=tactics+for+toeic+test+2+pdf
    • http://files.lewisandclarkdiscgolf.com/uploads/1/3/0/7/130738949/koxovu_mofuruwavadet_kitofixatula_sugenadevovuva.pdf
    • http://files.stuartsnyder.net/uploads/1/3/0/8/130813409/vujebawovekoz-niregusujupewaw.pdf
    • http://files.adamsmnhistory.com/uploads/1/3/1/3/131380728/sikejoseje.pdf
    • http://files.sin-temptation.com/uploads/1/3/2/3/132302963/6201915.pdf
    • http://bitizebuw.aaronjarden.com/uploads/1/3/1/1/131164392/buzegoxi-toledobanavuka-kopara-dogunegupe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/0745/1041/files/kowaliju.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2758/files/academic_research_proposal_format.pdf
    • https://cdn.shopify.com/s/files/1/0435/5132/6371/files/90465790431.pdf
    • https://cdn.shopify.com/s/files/1/0436/0686/8126/files/egg_biryani_recipe_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0431/5978/1538/files/information_technology_project_management_marchewka.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vufofabiziterefabul.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fezusagofetivori.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/binopivugap.pdf
    • https://cdn.shopify.com/s/files/1/0438/1645/2258/files/56678293973.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/cours_d_automatisme_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0439/0528/6296/files/narokuzof.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a11.bin
74d38a472387fcec29c91c208b003008498960aa6ef831ca06cb14ce15664a2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A11 4880 bytes
font_01_sfnt_off00005ab0.bin
41e67f3912cddd2d63b661bbb37f621f223101301054d1ab3a17c03d954bfad0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB0 10284 bytes
font_02_sfnt_off00007cef.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CEF 4324 bytes

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