Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f90465949baef59…

MALICIOUS

PDF

54.5 KB Created: 2020-08-29 03:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ce058c26432aaae83f6076544c53569 SHA-1: 9b8b9a9caeeb06d825959fccbef005771cf8acf9 SHA-256: 3f90465949baef5970155ec245b41251e7d878701e5a3b635a80643cba1faf38
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wix?keyword=ccass+guide+hkex'. Additionally, it features a large number of external PDF links, many hosted on Shopify, suggesting a link farm for SEO manipulation or traffic redirection. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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/wix?keyword=ccass+guide+hkex
    • https://cdn.shopify.com/s/files/1/0436/7237/1350/files/xasaduziwipusado.pdf
    • https://cdn.shopify.com/s/files/1/0441/1061/0584/files/metric_conversion_worksheet_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0448/4068/1633/files/stardew_valley_sprinkler_layout.pdf
    • https://cdn.shopify.com/s/files/1/0433/0133/9304/files/affectation_du_rsultat_ohada.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/54855631485.pdf
    • https://cdn.shopify.com/s/files/1/0432/5058/1662/files/gebuxejolapafezofegoza.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5800/files/3471913412.pdf
    • https://cdn.shopify.com/s/files/1/0435/5286/6455/files/jowafitoz.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf06db6377ef4ddfb04177b6b9c02e47.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa4956cd0a6c44faac8d2f66fbb55a3b.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9b2ef56ed0646378b0e8c36498e3b36.pdf
    • https://static.usrfiles.com/ugd/b8c837_d824dd26c0dd4b38ba26063f9bb9d10e.pdf
    • https://cdn.shopify.com/s/files/1/0434/7982/6582/files/larijuxij.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/macarthur_bob_ong.pdf
    • https://cdn.shopify.com/s/files/1/0438/0616/3105/files/lm386_audio_amplifier_circuit.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008c74.bin
7be27276a174f2acf4372f3ca124d617bfe61b8836b86669e8bc16b31969387f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C74 4816 bytes
font_01_sfnt_off00009ccc.bin
cc2be2f333e26f884320ca172225b0d0b3f6d3e4f25941c571a0f97ff9321966		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CCC 9972 bytes
font_02_sfnt_off0000becc.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBECC 4324 bytes

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