Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25721baed69af3d…

MALICIOUS

PDF

46.5 KB Created: 2020-09-06 09:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: eb7d580386a2bd81a01eead8c3c70fea SHA-1: 2db8b4e80a0538b53d8f422c7fdc25405c743e86 SHA-256: b25721baed69af3d0852677b01f2bf9c6ed06807c8993e2f309787d278ede36a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users. One of the primary links, 'https://ttraff.cc/wix?keyword=syndrome+face+deformity', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL and several benign-looking PDF links.

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/wix?keyword=syndrome+face+deformity In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static.usrfiles.com/ugd/36f25b_6635a5b1bab9418e86d5309b3937a010.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/defcb2_2e377b9a87d44cea99e760539c86086b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_432c4d5cc2ed4671be651a03bfab536d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_ec07f4d7eb984ae492582043b5a560e4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_d1b8ade76229454ea10986fb5444fb58.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/7275/7406/files/18909029891.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0652/4566/files/prentice_hall_geometry_textbook_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2781/5833/files/cheta_ki_chaitwal_song.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9327/6312/files/33256109346.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/7244/6613/files/spot_it_game_math.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2613/6743/files/clinical_medical_administrative_assistant_training_manual_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7241/3079/files/system_analysis_and_project_management.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6713/6413/files/megepisiwanewu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9138/5758/files/fezuzifanus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9360/6046/files/letadinatan.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C49 4948 bytes
SHA-256: 3aa9cb1d84c7f4295ec5392390bdda43a9f90b2e93edcc6c8ef8c324a71a7228
font_01_sfnt_off00007cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CFF 10196 bytes
SHA-256: 87ba0fb0f4389dc50eba223fca2df2e57e1d516aff18b35df6658936d948fc16
font_02_sfnt_off00009f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F50 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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