Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e474c2c9e9b8cc…

MALICIOUS

PDF

56.7 KB Created: 2020-08-12 15:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 784188d104047e47a07016b2fc10ffdd SHA-1: 45dd0f185aad49e2532c5ae68c22a73f5251b14c SHA-256: 73e474c2c9e9b8cc66ebb0de2fb10deca4da55925c8b6ca83db73e7c03d7a863
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 external PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=exercice+atomistique+pdf'. The document body, though heavily obfuscated, also contains this URL, indicating a deliberate attempt to direct users to malicious content. The ML classifier strongly supports the malicious nature of this 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=exercice+atomistique+pdf
    • http://files.thedynamicbody.org/uploads/1/3/2/6/132681767/negemo.pdf
    • http://files.cheswest.com/uploads/1/3/2/6/132682787/tejobujez.pdf
    • http://jujebiv.helpmeimgettingmarried.com/uploads/1/3/0/7/130776445/rujusasukewajeweriwo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0238/7867/files/algebra_for_college_students_robert_blitzer.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/62971956679.pdf
    • https://cdn.shopify.com/s/files/1/0432/0899/9074/files/45017868024.pdf
    • https://cdn.shopify.com/s/files/1/0429/2670/2758/files/bsc_physics_syllabus_magadh_university.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7872/files/amazon_echo_dot_3rd_generation_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/1264/4251/files/59861067111.pdf
    • https://cdn.shopify.com/s/files/1/0434/2598/8757/files/kadirujetifuse.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1281/files/7057736456.pdf
    • https://cdn.shopify.com/s/files/1/0431/3569/7063/files/jarilitakamuni.pdf
    • https://cdn.shopify.com/s/files/1/0428/9983/2995/files/49361752548.pdf
    • https://cdn.shopify.com/s/files/1/0435/0096/1947/files/alimentos_con_alto_contenido_de_potasio.pdf
    • https://cdn.shopify.com/s/files/1/0437/1510/0826/files/73636253350.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/pengertian_anoreksia_nervosa.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_off00009ad6.bin
17b34dbc3bb0c0c997d7944acc165e534ee9968a912011215a6c30b2db1a887f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AD6 5420 bytes
font_01_sfnt_off0000ad2b.bin
82d51343fde904856d26240ea52184155b8fb6ad64813a6d41e3e58bfc3afd86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD2B 12368 bytes

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