Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5169b97e2e39da7…

MALICIOUS

PDF

41.9 KB Created: 2020-08-21 06:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 79f14f9c2b5e1360e2c600e614224882 SHA-1: b14f7b671fdd3527680f0f5c303ac7c783d3358d SHA-256: f5169b97e2e39da7e203fbc161f275059929a8912dda2e019a7b4a1e6f75fb90
154 Risk Score

Malware Insights

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

This PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'Berlin blockade worksheet pdf'. The presence of multiple external PDF links, many pointing to Shopify, suggests a link farm designed to obscure the malicious redirector. The primary malicious URL identified is https://ttraff.cc/pify?keyword=berlin+blockade+worksheet+pdf.

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=berlin+blockade+worksheet+pdf In PDF document text
    • http://norixaro.thisorthatkids.com/uploads/1/3/2/7/132741555/xojaketidepusogobo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6892/3799/files/41209494516.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5649/5783/files/42648067134.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0870/4164/files/how_to_enable_guided_access_on_iphone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7078/3645/files/51047342040.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6467/1906/files/addition_properties_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/63105790712.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/1385/3599/files/compton_school_finchley_uniform.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/3444/7770/files/java_config_files.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0213/3667/files/functional_anatomy_of_yoga_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/carcinoma_de_celulas_escamosas_felinos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3009/3728/files/58992572661.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65F3 5588 bytes
SHA-256: a0db03a07593e735a403d68f27348622ff53a5f951a9cb51b2ae15c7db16197f
font_01_sfnt_off000078f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78F9 10000 bytes
SHA-256: 05dbf41ae066af4e43662b9c7812cba3766908dad5910e1769e3012f5cbb0dcb

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