Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ebea435aa98cbba…

MALICIOUS

PDF

45.9 KB Created: 2020-08-25 09:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2baff6a826da98dd67b1f695af8e5214 SHA-1: 5d01eac71c39beba4008c71c6ba967d3b1533805 SHA-256: 6ebea435aa98cbba7daa03d8eccfba192352f271bdac2d6bfa6e0e3bbcaf35b6
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including a malicious redirector to 'ttraff.cc' which then leads to a link farm of other PDFs. The document body, though obfuscated, contains URLs that suggest a lure to a crossword puzzle, likely to disguise the malicious intent of directing users to potentially harmful content. The ML classifier strongly indicates maliciousness.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=cooking+terms+crossword+puzzle+answers
    • http://files.kinetes.com/uploads/1/3/2/8/132815854/c3d73bb01b.pdf
    • http://bedawukas.deyrecreativedesignsexpressions.com/uploads/1/3/1/0/131070487/sekokapolopo.pdf
    • http://povomuleb.codamidwest.org/uploads/1/3/1/3/131379732/vowapazol-ridan.pdf
    • http://vogatuw.baldwintoys.com/uploads/1/3/0/7/130740510/fobejurovupubebikud.pdf
    • http://files.saintandrewslutheran.org/uploads/1/3/2/3/132302941/mubirobolowe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/95360196840.pdf
    • https://cdn.shopify.com/s/files/1/0439/2927/2488/files/flow_sheet_template_medical.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1821/files/14061905834.pdf
    • https://cdn.shopify.com/s/files/1/0444/7459/7543/files/bootstrap_4_responsive_dashboard_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/2794/5889/files/xofutumaboxixijajajig.pdf
    • https://cdn.shopify.com/s/files/1/0436/9108/1882/files/google_sheets_templates_personal_budget.pdf
    • https://cdn.shopify.com/s/files/1/0435/4765/6351/files/ndlea_referee_form.pdf
    • https://cdn.shopify.com/s/files/1/0437/2093/3528/files/saxode.pdf
    • https://cdn.shopify.com/s/files/1/0432/6529/4504/files/oxy_acetylene_gas_cutting.pdf
    • https://cdn.shopify.com/s/files/1/0433/5609/4614/files/86416644304.pdf
    • https://cdn.shopify.com/s/files/1/0427/7128/4135/files/mere_paas_tum_ho_full_song.pdf
    • https://cdn.shopify.com/s/files/1/0432/7453/5067/files/study_island_keystone_biology_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/0056/0803/files/45885428105.pdf
    • https://cdn.shopify.com/s/files/1/0430/5561/2058/files/bosijiwojufefaz.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_off000065e3.bin
bcc9f6f5fb98d6b18186b12625cd5740696049e19fdf8ec0a5a6bf3bba87131a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E3 5504 bytes
font_01_sfnt_off000078a2.bin
45e7b57d6b9ea646c6f0aff3f3e978a0472abf88d3a9bd91d3b3e78ebb6b5f72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A2 10408 bytes
font_02_sfnt_off00009c33.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C33 4324 bytes

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