Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6b75044dc3a2b8…

MALICIOUS

PDF

49.9 KB Created: 2020-08-25 01:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 892a521c7f816ef48206e674cac812b4 SHA-1: d505ae5808f9c7dd49dce777dac0d52cf23d7eac SHA-256: 5c6b75044dc3a2b8ee262a14ee9d33fb357a8a951093900add75e0dac3f08e32
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though partially corrupted, contains a URL that appears to be a lure for a 'Comptia cloud plus study guide'. The PDF also hosts a large number of external links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content.

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.com/pify?keyword=comptia+cloud+plus+study+guide
    • http://files.jwomedia.com/uploads/1/3/0/7/130740118/08eefc6a9484.pdf
    • http://ludof.cosmetictattoostudio.com/uploads/1/3/1/6/131606345/suvuku-limosufukano-sovala-midewutabig.pdf
    • http://kovizuve.district12volleyball.com/uploads/1/3/1/1/131163599/zafimawikaf.pdf
    • http://files.bingocompany.net/uploads/1/3/1/3/131379612/d2857f2095895b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/8318/5832/files/49121727743.pdf
    • https://cdn.shopify.com/s/files/1/0435/7029/9038/files/zaziximuf.pdf
    • https://cdn.shopify.com/s/files/1/0461/6437/7752/files/bahubali_1_song_in_tamil_masstamilan.pdf
    • https://cdn.shopify.com/s/files/1/0432/4386/4228/files/9428530232.pdf
    • https://cdn.shopify.com/s/files/1/0433/5350/5946/files/49679746786.pdf
    • https://cdn.shopify.com/s/files/1/0431/6548/3172/files/consumer_reports_air_purifier_buying_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/6922/6656/files/cerebrospinal_fluid_flow.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/92222698339.pdf
    • https://cdn.shopify.com/s/files/1/0433/8660/1635/files/caida_libre_delos_cuerpos_fisica.pdf
    • https://cdn.shopify.com/s/files/1/0432/4360/2080/files/assignee_vs_reporter_in_jira.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9816/files/88197821849.pdf
    • https://cdn.shopify.com/s/files/1/0454/3184/9128/files/consulting_invoice_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/xuxabizivamojeleko.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_off000077c8.bin
35508c09f02e47b26487310c57e434b13fb1b4236165f70060fef13ba4c9282d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C8 5196 bytes
font_01_sfnt_off0000897d.bin
5d28ab8fd6d0dd0f10d77b6a01d752e4aefc9ea1449446ad740835e0bfc3436b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x897D 10316 bytes
font_02_sfnt_off0000acd5.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACD5 4324 bytes

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