Malicious PDF — malware analysis report

Static analysis result for SHA-256 8581e0e6edb445df…

MALICIOUS

PDF

42.1 KB Created: 2020-08-06 12:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbefbd5978001a2a0e506e5d8e243efc SHA-1: fc5e6265a2b3d860637c077326685f9a04e54747 SHA-256: 8581e0e6edb445df316d8f4d169e1bb989344cd1c46911bd5313189070a155fb
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a primary redirector URL pointing to malicious infrastructure. The document body, though heavily obfuscated, contains the primary redirector URL, suggesting an attempt to lure users to a malicious site. The ML classifier strongly indicates maliciousness, and the presence of numerous external links supports a link-farming or redirection-based attack pattern.

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=electrical+design+for+building+construction+pdf
    • http://files.mbhousesandgardens.com/uploads/1/3/0/7/130775786/9860f233.pdf
    • http://files.empachernorthamerica.com/uploads/1/3/2/6/132681560/1543305.pdf
    • http://files.ionnibiru.com/uploads/1/3/0/8/130873855/3685ac83.pdf
    • http://files.ziaholly.com/uploads/1/3/1/4/131406785/991841.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4241/4487/files/adductor_muscle_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0433/6415/5560/files/advanced_ankle_strengthening_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0432/6621/2003/files/fezurufuvufiji.pdf
    • https://cdn.shopify.com/s/files/1/0431/8288/2980/files/23340067992.pdf
    • https://cdn.shopify.com/s/files/1/0437/5052/3029/files/bunkie_test_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/2921894926.pdf
    • https://cdn.shopify.com/s/files/1/0430/6383/6834/files/byomkesh_bakshi_all_story.pdf
    • https://cdn.shopify.com/s/files/1/0432/0365/7887/files/diagnostico_institucional_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0431/9484/3293/files/lakenigonobuzolovofe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41841620016.pdf
    • https://cdn.shopify.com/s/files/1/0435/7816/3359/files/asmaul_husna_dan_artinya_untuk_anak_anak.pdf
    • https://cdn.shopify.com/s/files/1/0437/1608/3877/files/82517061486.pdf
    • https://cdn.shopify.com/s/files/1/0430/1045/7753/files/nusitobobojuwalazoge.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_off00006556.bin
817ed0210c8c8d2d0912d72228c67ad1269ab59324f1b0d7c637ad6799910802		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6556 5420 bytes
font_01_sfnt_off000077d0.bin
b594381ffafa94893a3236ebbf494f7ad21f3632c5bd336b222f30bb59f8c1c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77D0 10396 bytes

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