Malicious PDF — malware analysis report

Static analysis result for SHA-256 85523048d7e61c4a…

MALICIOUS

PDF

50.2 KB Created: 2020-08-31 07:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed1ba4661e79acefc05f8745e8125fe5 SHA-1: 145fab2486217666867e432a1604b27aa3e1c261 SHA-256: 85523048d7e61c4aac6c046fcb925d39b779282450b76fd4eb14de26b00060a5
162 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious domain, masquerading as a free download. This is further supported by heuristics indicating the PDF is a redirector and part of a link farm. The document body and embedded URLs reinforce the lure of downloading content, likely to lead to a malicious payload or phishing site.

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=download+free+gospel+ringtones+android
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2619/4336/files/capitale_des_pays_africains.pdf
    • https://cdn.shopify.com/s/files/1/0433/0107/7142/files/88781761653.pdf
    • https://cdn.shopify.com/s/files/1/0434/7507/5225/files/blouse_cutting_method_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8433/2710/files/chamberlain_liftmaster_pro_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/5325/2757/files/48946213111.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8918/files/bufetugasofarob.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/nitrate_ion_selective_electrode.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97253363073.pdf
    • https://cdn.shopify.com/s/files/1/0431/6063/3504/files/riselif.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3356/files/sat_biology_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/87496096307.pdf
    • https://cdn.shopify.com/s/files/1/0437/0844/8919/files/high_performance_polyurethane_water_based_topcoat.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/kenmore_500_series_washer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/62350101225.pdf
    • https://cdn.shopify.com/s/files/1/0469/3311/5035/files/exercicios_de_produto_notavel_vestib.pdf
    • https://static.usrfiles.com/ugd/d3758e_05f72654dca74f9a9b5eaac68d3c8f8c.pdf
    • https://static.usrfiles.com/ugd/e3c460_f782fc18c5654bf095e48342006ed080.pdf
    • https://static.usrfiles.com/ugd/87fdc7_fbc337dfa03a4720af2094e5a1c21446.pdf
    • https://static.usrfiles.com/ugd/822ecd_0ffe3bdc204844f28f8de0c59049b3e7.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062ef.bin
5ed1bd0596781dc1ca693cbbae67d2f68d327460cd3b34b911ac55323cd71690		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62EF 5300 bytes
font_01_sfnt_off00007515.bin
f1746f4a41cd8ae07a1a679700ee4ecdaaaeca805ea49b87d942cba4734359f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7515 2216 bytes
font_02_sfnt_off00007f26.bin
b29a496c601b4ee87a2e9fec3c96711613750b98bd115270ae96f14cf5643ada		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F26 10604 bytes
font_03_sfnt_off0000a3be.bin
ed22ffc27cbf8a2751983afa3d49ee37c71f320a50824b300f9b7a4ed5430031		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3BE 16604 bytes

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