Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1bcb023d7913c1…

MALICIOUS

PDF

39.7 KB Created: 2020-08-16 20:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfac131614f593667f712be8a37b4262 SHA-1: 3d20a876a5ae5d8d13175f08bb1422e841ec28a9 SHA-256: cf1bcb023d7913c1be2d647714e3b7d2df300f4b53028212b9f36a7fc127e1d8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF file contains a large number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=journal+entry+template+in+excel'. The document body, though heavily obfuscated, contains this URL and references to 'journal entry template in excel', suggesting a lure. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=journal+entry+template+in+excel
    • http://polafil.theadaptedbook.com/uploads/1/3/0/8/130874493/tebunares.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61259485886.pdf
    • https://cdn.shopify.com/s/files/1/0430/6714/6397/files/sukuweboxe.pdf
    • https://cdn.shopify.com/s/files/1/0435/3028/9311/files/degradacin_de_los_suelos.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/define_political_economy.pdf
    • https://cdn.shopify.com/s/files/1/0438/7697/4747/files/pre_calculus_grade_11_stem.pdf
    • https://cdn.shopify.com/s/files/1/0434/5013/8784/files/37546837272.pdf
    • https://cdn.shopify.com/s/files/1/0433/9898/7941/files/nedubejawavatovonapere.pdf
    • https://cdn.shopify.com/s/files/1/0435/9471/1203/files/types_of_aeroplanes.pdf
    • https://cdn.shopify.com/s/files/1/0438/8611/7032/files/ankush_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6072/files/dizepujozeragedazegexo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6766/files/digital_marketing_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0439/0181/2904/files/battlefield_of_the_mind_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/zuxidebivezikuvaduwow.pdf
    • https://cdn.shopify.com/s/files/1/0437/2011/4344/files/beramuxamititebumaxepiko.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d0f.bin
bd4d7acc888dc9f95b8bfa8039f406d8fedd28c3e3df025c78c8e7f8e0c19090
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D0F 5060 bytes
font_01_sfnt_off00006e42.bin
c0d8f5ed6717dcc5291832a1bfd9f5ee10cd138528bf0d2d3febb893e108fe41
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E42 10472 bytes