Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a19c5db1826e02…

MALICIOUS

PDF

44.9 KB Created: 2020-08-19 08:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f07f9e5def34af850abf832addfdfaf SHA-1: 9c418394a7befa64eb903d3d37a5191bed95219c SHA-256: 63a19c5db1826e02f5fe248847bdd53944974f61da315471db82edd67d0eb23a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to generate SEO traffic. One prominent URL, 'https://ttraff.com/pify?keyword=informatie+despre+columna+lui+traian', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially obfuscated, contains this URL and other links, suggesting an attempt to direct users to malicious infrastructure.

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=informatie+despre+columna+lui+traian
    • http://files.zionsvillechamber.org/uploads/1/3/1/8/131856353/pigazodozuzuv.pdf
    • http://files.birth-roots.co.uk/uploads/1/3/1/4/131437454/pifesup.pdf
    • http://files.cubeditpos.com/uploads/1/3/1/1/131163669/kivuwojojunoxa.pdf
    • http://files.kindredliveband.com/uploads/1/3/0/9/130969241/nageduz.pdf
    • http://files.bhexclusivecollections.com/uploads/1/3/1/4/131437421/fivek_jedojixogi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/7838/3771/files/millennials_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0433/8437/3406/files/how_do_you_type_a_smiley_face.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5085/files/bjp4_self-_check_2._3_expressions1.pdf
    • https://cdn.shopify.com/s/files/1/0445/3846/2372/files/27704976726.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/37021709014.pdf
    • https://cdn.shopify.com/s/files/1/0431/8311/2341/files/99140634350.pdf
    • https://cdn.shopify.com/s/files/1/0433/4000/5541/files/bits_and_bytes_ace_academy_electrical.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7876/files/xijejosinoguxinowebebaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0805/files/libros_aprender_frances_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0429/8552/1311/files/15646681186.pdf
    • https://cdn.shopify.com/s/files/1/0431/5919/1712/files/38319693582.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/girunifiviluvesesitusapu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5660/9957/files/regular_plural_nouns_worksheets.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_off0000700c.bin
aefc127f70730089b1049bd889003eb1a3aac3a0edac3f44443cc3a2eb1ea118		 pdf-font-stream PDF embedded font (sfnt) at offset 0x700C 5236 bytes
font_01_sfnt_off000081ba.bin
354d1e73d5d475113400ffc652be76aaa66b5b38a35a7f16cd132dba4fb4c327		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81BA 10788 bytes

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