Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e11abb9951955f…

MALICIOUS

PDF

47.6 KB Created: 2020-09-12 02:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aca33a8a63776a4a4a678997db7edbc2 SHA-1: 053ba0fbd3ec0a6ff38a2af2de2c75374ffc9bf3 SHA-256: 66e11abb9951955f9aeecd72ea7d5438063c3fcbc1009cde0fd8b95dbe6820f9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one identified as a malicious redirector, leading to a lure for a 'free home construction budget spreadsheet'. This suggests a phishing or scam attempt designed to redirect users to potentially harmful websites. 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.club/wix?keyword=free+home+construction+budget+spreadsheet
    • http://files.boostyourbodybootcamp.com/uploads/1/3/2/3/132303028/1144462.pdf
    • http://files.worldofsong.com/uploads/1/3/1/4/131408100/bijoresupafuxof-lonavifodo-fugazerezisuwoj-fuxelad.pdf
    • http://files.scituatefoodpantry.org/uploads/1/3/1/3/131380210/c8908.pdf
    • http://files.southernpeachtravelagency.com/uploads/1/3/0/7/130775825/876453.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/74e905_94dd944cd4a643a68959463eeb1384c6.pdf
    • https://static.usrfiles.com/ugd/b444d4_1e352d4cc0bc4939a04b31b3c68e2b12.pdf
    • https://static.usrfiles.com/ugd/e80f4c_0f11a51f19c14f14b78ca3f44d1fdf86.pdf
    • https://static.usrfiles.com/ugd/760101_2c53ded03be54de086157bf2c586d4ea.pdf
    • https://static.usrfiles.com/ugd/eed56f_16b90205f5774fb2a73ce4af71523339.pdf
    • https://static.usrfiles.com/ugd/b8c837_409c019efa9f4aa28a7a617c0d06b294.pdf
    • https://static.usrfiles.com/ugd/0049ca_56453abadf18417d8b98f287e88d64e3.pdf
    • https://static.usrfiles.com/ugd/963627_cbe7d786f7314bfca775d89ee70a8161.pdf
    • https://cdn.shopify.com/s/files/1/0432/8354/6267/files/zapoxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7739/3815/files/chemistry_notes_form_1_to_4.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/soruzibe.pdf
    • https://cdn.shopify.com/s/files/1/0437/4714/7928/files/63066634263.pdf
    • https://cdn.shopify.com/s/files/1/0437/2588/1498/files/payment_failed_do_not_honour.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_off0000793d.bin
351b52274432943782362dc29d4ee71d830a78986ece5bc2463b9e261ef7d3dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x793D 5552 bytes
font_01_sfnt_off00008bed.bin
93943d04496e3227d27b46d1f47be06fbd93a6cde8cc2f01bd31c15b7f54cc77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BED 10876 bytes

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