Malicious PDF — malware analysis report

Static analysis result for SHA-256 123bfe3492ef7936…

MALICIOUS

PDF

41.1 KB Created: 2020-08-14 12:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbc263e4a07ef787bdfce52718306536 SHA-1: 8c1a6a963c22f8c6e95422d382c85a8ca9403306 SHA-256: 123bfe3492ef7936fa25b66ff9c0ad43dbc94e6f3bc95da4ec8ce5bcfb8ab4e1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, and the 'PDF_SEO_LINK_FARM' indicates a large number of external links, likely for SEO manipulation or to host further malicious content. The ML classifier also strongly indicated maliciousness.

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=news+straddle+strategy+pdf
    • http://files.clearpathemployer.com/uploads/1/3/1/3/131383544/01eb14ca502.pdf
    • http://files.sthedwighistoryerie.com/uploads/1/3/0/8/130814439/1308366.pdf
    • http://files.rugbypr.com/uploads/1/3/1/3/131379832/dawuxifanitove-detirilise-kazuvevigumew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97697777452.pdf
    • https://cdn.shopify.com/s/files/1/0433/8535/6449/files/88853512256.pdf
    • https://cdn.shopify.com/s/files/1/0433/3400/8987/files/blender_3d_tutorial_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0427/4556/1254/files/beats_audio_for_hp_pavilion_dv7.pdf
    • https://cdn.shopify.com/s/files/1/0434/0888/3870/files/pewikiporuzutobamepuzoxit.pdf
    • https://cdn.shopify.com/s/files/1/0432/4986/0765/files/16474250062.pdf
    • https://cdn.shopify.com/s/files/1/0437/9115/5361/files/bapirowelajavinanaj.pdf
    • https://cdn.shopify.com/s/files/1/0450/5973/5704/files/affairscloud_june_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/0953/2316/files/varyasyon_at_varayti_ng_wika.pdf
    • https://cdn.shopify.com/s/files/1/0440/8783/6837/files/75622779079.pdf
    • https://cdn.shopify.com/s/files/1/0431/5335/8999/files/breaking_into_wall_street_lbo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6275/4461/files/beautiful_in_white_alto_sax_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5813/files/nemuxevoteloxesazakewevur.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_off000062ce.bin
1281ddb7dc8887aa4f51eaecdc493d02e185ab69d37c9874922c396cf4961e35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62CE 5372 bytes
font_01_sfnt_off00007542.bin
554908c6a33ae01b239fd52c2aadcb07cc0731b2ede7cea52add8320087c2cc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7542 10008 bytes

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