Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca781bf2500dbc3…

MALICIOUS

PDF

46.9 KB Created: 2020-09-02 17:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6fb3e5f8232fe04b4ea1a491df1c134 SHA-1: 20aabf2cb0fc103bfc372429e35a9654536659ff SHA-256: 5ca781bf2500dbc380b20c0fa82b72039daad0e8dc1936d572e2b29178b44457
162 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. It also exhibits characteristics of a PDF link farm, pointing to numerous external PDFs, one of which is 'static.usrfiles.com/ugd/067ecb_aa63f6009ae849768d76481a34b2d753.pdf'. The presence of a 'download button' heuristic further suggests a lure-based attack. While no scripts were explicitly extracted, the PDF structure and malicious links indicate an attempt to redirect users to malicious content, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=mozilla+offline+installer+kuyhaa
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/067ecb_aa63f6009ae849768d76481a34b2d753.pdf
    • https://static.usrfiles.com/ugd/32acb1_e98fb9fd47af420cb54f3c84383276a1.pdf
    • https://static.usrfiles.com/ugd/8ba634_a142acfb78214dbcac03a90a3a5eecdd.pdf
    • https://static.usrfiles.com/ugd/5e8de6_55419de9b7a143bd9258b77efad8edde.pdf
    • https://static.usrfiles.com/ugd/38eac1_ffb350f451e441798ac00892a1b50e50.pdf
    • https://static.usrfiles.com/ugd/1a89c8_93db8b12f8dc4dd38594a6ea37e8b240.pdf
    • https://static.usrfiles.com/ugd/a467d2_79f9c5d627d64b76ba628c5cbfcb335f.pdf
    • https://static.usrfiles.com/ugd/b48b60_2c6e91e2e7e340148dc080841112af94.pdf
    • https://static.usrfiles.com/ugd/607883_e2e802d942494954895ba22c658e83d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_5def78df6d9a4c24803373e69d6f63c3.pdf
    • https://cdn.shopify.com/s/files/1/0429/2267/2284/files/beverages_list.pdf
    • https://cdn.shopify.com/s/files/1/0430/4162/0119/files/nirarilinuxegabu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8296/3361/files/73134690632.pdf
    • https://cdn.shopify.com/s/files/1/0431/6659/7288/files/9947217918.pdf
    • https://cdn.shopify.com/s/files/1/0456/4221/9687/files/battle_royale_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/4288/2215/files/9368128565.pdf
    • https://cdn.shopify.com/s/files/1/0437/9944/5664/files/ppi_reclaim_form_template_letter.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rewosegukedisupagur.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_off00006b88.bin
467ad43e5055db8c2031ca5fa8869abc3ed7f55f2160d03003bdbf35946d503e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B88 4960 bytes
font_01_sfnt_off00007c70.bin
67d83d35f4c5aa8a35bbaa3bcb8488474d9d5db43df98b46e19e6d0a9e92c2f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C70 10360 bytes
font_02_sfnt_off00009fef.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FEF 4324 bytes

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