Malicious PDF — malware analysis report

Static analysis result for SHA-256 6478d33deb38c5ac…

MALICIOUS

PDF

46.6 KB Created: 2020-08-19 21:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8c9e8c3d9a1866ba92b1dbdffbd4efd SHA-1: 253dbdde26de547ff96a7adefbc0d0aef03eda4f SHA-256: 6478d33deb38c5ac0976053f821d7c88011acba9741ea5efd1618a7525f8e907
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, disguised with text suggesting a free messenger app. The ML classifier strongly indicates maliciousness. The embedded URLs are likely part of a phishing or scam campaign, aiming to redirect users to malicious sites.

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=free+messenger+app+for+facebook
    • http://files.wilsonbaseballcamp.com/uploads/1/3/1/6/131636841/bogekipujolu.pdf
    • http://files.homewareimports.com/uploads/1/3/2/6/132696155/2992088.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/4227/4471/files/83578109349.pdf
    • https://cdn.shopify.com/s/files/1/0427/4274/3207/files/sevusoputidadizanexifodu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/xomumisabilenuva.pdf
    • https://cdn.shopify.com/s/files/1/0434/0157/6602/files/saboteur_board_game_rules.pdf
    • https://cdn.shopify.com/s/files/1/0435/1465/8980/files/20452635485.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/wugidepazaposekeropan.pdf
    • https://cdn.shopify.com/s/files/1/0437/4305/1937/files/34706186816.pdf
    • https://cdn.shopify.com/s/files/1/0439/1341/2760/files/personal_qualities_of_an_entrepreneur.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2695/files/jan_richardson_guided_reading_next_steps.pdf
    • https://cdn.shopify.com/s/files/1/0432/9239/3640/files/psychology_12th_edition_wade.pdf
    • https://cdn.shopify.com/s/files/1/0430/0714/8185/files/bazimiwijaziwov.pdf
    • https://cdn.shopify.com/s/files/1/0432/8803/5486/files/me_bola_chatting_karegi_kya_song.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/zewaf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006952.bin
3dbb91eca1fe3dae7b4fe31638ddb97d235d21e7f5dcd62061f257cdc2af6275		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6952 5124 bytes
font_01_sfnt_off00007a97.bin
26b39e6918d6c0bb6c6a1f4cc0f379b59c9d37c37b7eb84720cf241501f75f41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A97 10592 bytes
font_02_sfnt_off00009ed9.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ED9 4324 bytes

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