Malicious PDF — malware analysis report

Static analysis result for SHA-256 e721ef33035ec49e…

MALICIOUS

PDF

43.5 KB Created: 2020-09-01 15:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc3c59ac0c37870056da3ebd58a56d41 SHA-1: 6be39f9e9b6c288b4cb11fe5b990080fe084740c SHA-256: e721ef33035ec49e571f0598963cd1b1b8af523e6e32d4890415ca26d15b1b47
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it features a PDF link farm with numerous embedded URLs, many pointing to Shopify domains. The primary malicious URL identified is 'https://ttraff.cc/wix?keyword=free++catapult+king'. The document body contains garbled text but includes the same malicious URL and references to 'wkhtmltopdf', suggesting it's a generated PDF designed for malicious redirection.

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=free++catapult+king
    • https://cdn.shopify.com/s/files/1/0431/4424/9499/files/12935808713.pdf
    • https://cdn.shopify.com/s/files/1/0431/2639/0951/files/riromaxawafopuwonotam.pdf
    • https://cdn.shopify.com/s/files/1/0435/6574/4287/files/criterios_de_normalidad_y_anormalidad_en_psicopatologia.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6335/files/68034455986.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2250/files/ashok_leyland_electric_bus_specifications.pdf
    • https://cdn.shopify.com/s/files/1/0433/4678/8502/files/jupaligunawikokil.pdf
    • https://cdn.shopify.com/s/files/1/0429/1647/9132/files/xukid.pdf
    • https://cdn.shopify.com/s/files/1/0436/9675/0742/files/33938463696.pdf
    • https://cdn.shopify.com/s/files/1/0434/1134/1479/files/baruropogumaje.pdf
    • https://cdn.shopify.com/s/files/1/0436/9927/3882/files/wifewazivudezojuxebek.pdf
    • https://cdn.shopify.com/s/files/1/0462/6913/7045/files/57196726672.pdf
    • https://cdn.shopify.com/s/files/1/0428/6119/9526/files/fibere.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d0f.bin
02ffe7bf1096839ce6f29d705fe9274fdeb622082d384458bbbefd0be1110ece		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D0F 4940 bytes
font_01_sfnt_off00005dec.bin
cf50d13c5c21d2e34fba0d9dd21119d4839fc35fdaebfe62cbacf51850cc328d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEC 1936 bytes
font_02_sfnt_off0000672b.bin
b713988be879a7ec295ef67c0b120977c0305987619f87a9902c02eb677d2c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x672B 10096 bytes
font_03_sfnt_off000089f0.bin
6005c40bf4088b3dc25d2c06c912ef9e16c458fe8ed3c680bd14d8f948b31738		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89F0 16728 bytes

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