Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2615389c002d3f…

MALICIOUS

PDF

40.4 KB Created: 2020-08-07 04:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b36eac34292b8ef27a63467642d9d1e SHA-1: 0f22f5c3e0ddf70b08f1be3048c399eea661ae45 SHA-256: 6b2615389c002d3f45d969c089d22e4a80e026ff5618bcaee33ef25220111b10
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 resources, forming a link farm. One prominent link, 'https://ttraff.com/pify?keyword=multiplication+coloring+worksheets+pdf+free', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure under the guise of educational content.

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.com/pify?keyword=multiplication+coloring+worksheets+pdf+free
    • http://files.travelwhisperer.org/uploads/1/3/0/8/130874588/sifijadubujufixotopu.pdf
    • http://files.k-mitchell.com/uploads/1/3/1/8/131871729/kenevexodiwezi-sobikuv-wozisesafe.pdf
    • http://files.riversideministries.com/uploads/1/3/1/4/131437515/1207910.pdf
    • http://files.bigdsfireworks.com/uploads/1/3/1/6/131637635/xibimokuti.pdf
    • http://files.accoladeglobal.com/uploads/1/3/2/6/132696012/wodovotu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4925/5061/files/99839351400.pdf
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/xedoxolaparegegoruf.pdf
    • https://cdn.shopify.com/s/files/1/0434/5715/1129/files/d_d_races_5e.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1920/files/tetis.pdf
    • https://cdn.shopify.com/s/files/1/0431/8724/1119/files/19146402489.pdf
    • https://cdn.shopify.com/s/files/1/0439/4339/5483/files/6th_grade_physical_science_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/1510/9794/files/english_russian_picture_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/letowopebofowebizuwir.pdf
    • https://cdn.shopify.com/s/files/1/0434/7294/5304/files/26744213414.pdf
    • https://cdn.shopify.com/s/files/1/0438/6249/1286/files/articulations_in_music.pdf
    • https://cdn.shopify.com/s/files/1/0429/7320/0537/files/59989222615.pdf
    • https://cdn.shopify.com/s/files/1/0439/0954/6136/files/49563625990.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_off00005fdf.bin
63b0936f9b8f9bc7ce448ed4433f0a4fc11ca9c8303f62a3adc0f9f7facdf612		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDF 5580 bytes
font_01_sfnt_off000072ef.bin
1649492c5a1f5738431b38d519c106e0a430a9b3bcb276f542dbdce49bace37e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72EF 9788 bytes

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