Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7b6d3a3ffb88a3…

MALICIOUS

PDF

44.5 KB Created: 2020-08-25 17:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d685f99cc8cafdaa998a24fdecebada8 SHA-1: 7ebfb152d4cb3f0cfcf141b4794c9a736afea1a9 SHA-256: 3a7b6d3a3ffb88a32d4448ae9c3620b09232b5d99bd660ad4d13b11b526518bc
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the string 'Abelia planting guide' and the malicious URL, suggesting a social engineering lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which point to potentially malicious or unknown domains. The ML classifier 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.cc/pify?keyword=abelia+planting+guide
    • http://penusomoj.evelineverhulst.nl/uploads/1/3/1/4/131453540/9544758.pdf
    • http://files.axent-global.com/uploads/1/3/0/7/130776393/rufaranitosim_mexovelugidepi_tisufimerirex.pdf
    • http://files.daimatours.com/uploads/1/3/1/4/131437766/18aacb49a0a.pdf
    • http://files.artivism2019.com/uploads/1/3/1/8/131872238/sasibivos-zosuxuposepo.pdf
    • http://files.jaysuneatstaipei.com/uploads/1/3/1/4/131408581/niwaxe_farajevevaza_vuranepulezube.pdf
    • http://files.jaysuneatst
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/edit_file_text_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/7704/2325/files/65265985492.pdf
    • https://cdn.shopify.com/s/files/1/0429/4351/2732/files/airliner_world_download.pdf
    • https://cdn.shopify.com/s/files/1/0447/9988/5463/files/calendario_2020_colombia_con_festivos.pdf
    • https://cdn.shopify.com/s/files/1/0435/1610/0776/files/xusugusiru.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/bifoxigivemixadomuza.pdf
    • https://cdn.shopify.com/s/files/1/0440/1859/8053/files/rogopozijusigenide.pdf
    • https://cdn.shopify.com/s/files/1/0431/4379/0760/files/air_ride_5th_wheel_hitch.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/63716303735.pdf
    • https://cdn.shopify.com/s/files/1/0435/9979/0243/files/fewez.pdf
    • https://cdn.shopify.com/s/files/1/0430/1553/6793/files/46036262381.pdf
    • https://cdn.shopify.com/s/files/1/0440/8714/8709/files/81682090342.pdf
    • https://cdn.shopify.com/s/files/1/0428/9485/2252/files/kuvuzotitodun.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_off00006f90.bin
36dd8de213694f7c922a24201a79be8958c228acb9fb3d4d1db95e74d0b38930		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F90 4984 bytes
font_01_sfnt_off0000808b.bin
bfe2d402661d44383af3798501b6ca83f2eff6cca424ef31c0e16b18341f12ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x808B 10596 bytes

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