Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90817963fe5ea57…

MALICIOUS

PDF

135.6 KB Created: 2020-08-13 16:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11f0b3242831105220436b6f8ec9b3d5 SHA-1: fdaec62087f38e6482f2676024de97bdc418663a SHA-256: c90817963fe5ea57e1b3dcb576cc8e50030865be7eaa0606946e192d5d1bdd62
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.ru/pify?keyword=ontario+ambient+air+quality+criteria+pdf'. Another critical heuristic identified a PDF link farm, with many links pointing to Shopify domains, suggesting an attempt to disguise malicious content within a seemingly legitimate platform. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.ru/pify?keyword=ontario+ambient+air+quality+criteria+pdf
    • http://files.skills4podium.com/uploads/1/3/1/3/131380063/wutuzeti_nereno.pdf
    • http://files.theconnectiontaylor.com/uploads/1/3/1/4/131482968/pedoluka_zokiwidigifur.pdf
    • http://files.dancelikeacupcake.com/uploads/1/3/0/7/130776267/vixodejawodefafiba.pdf
    • https://cdn.shopify.com/s/files/1/0430/8657/7818/files/mitosis_and_meiosis_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0436/8374/1849/files/the_longman_writer_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/3160/8989/files/tigopodijesemazijuwetifi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8076/0990/files/xukunobijigosovud.pdf
    • https://cdn.shopify.com/s/files/1/0431/5355/5624/files/application_of_derivatives_ncert_solutions_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0130/6526/files/juwujojawidaxitufifusuro.pdf
    • https://cdn.shopify.com/s/files/1/0435/5312/8612/files/9683969542.pdf
    • https://cdn.shopify.com/s/files/1/0429/4089/1292/files/newogupakevet.pdf
    • https://cdn.shopify.com/s/files/1/0429/2434/3462/files/ars_magica_medieval_bestiary.pdf
    • https://cdn.shopify.com/s/files/1/0437/1618/2166/files/20404628804.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5193/files/algebra_math_notes.pdf
    • https://cdn.shopify.com/s/files/1/0438/2461/1478/files/genediragefijegifosuginu.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_off0001b517.bin
4e03e588f250ac5011cab46aea0e57f0ad8d072c56d2e138d3c410f8805d709a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B517 5400 bytes
font_01_sfnt_off0001c756.bin
792f4f76345a578a1be09a85730854b9f9c05c1d05e61a645188aab69e11f4a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C756 11240 bytes
font_02_sfnt_off0001ed92.bin
5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED92 16060 bytes
font_03_sfnt_off0002022a.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2022A 4324 bytes

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