Malicious PDF — malware analysis report

Static analysis result for SHA-256 aedc119b37b14b35…

MALICIOUS

PDF

45.9 KB Created: 2020-08-15 02:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caf212cc951a75a507aa23c52366284e SHA-1: fc3cecdf61beed96ec89ec44276b5d669b97934f SHA-256: aedc119b37b14b3577e52452dd803a8f60c2c59a86c9a2e1cdc18c6f77b30041
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as an educational worksheet. The document body, though heavily obfuscated, contains references to this URL and other URLs hosted on cdn.shopify.com and various other domains, suggesting a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful 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=present+simple+and+continuous+exercises+worksheets
    • http://files.anitagrandt.com/uploads/1/3/1/3/131382113/9000844.pdf
    • http://files.hawkesburytriclub.org/uploads/1/3/1/0/131070576/bonijoxubumi.pdf
    • http://xewexituz.thecitadeloflove.org/uploads/1/3/1/0/131070786/8280022.pdf
    • http://zixepagog.brownwoodartscouncil.org/uploads/1/3/1/8/131856772/pijapovat.pdf
    • https://cdn.shopify.com/s/files/1/0437/8450/3453/files/loi_binomiale_exercice_corrig.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0888/files/11556901970.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80884551140.pdf
    • https://cdn.shopify.com/s/files/1/0434/7396/1110/files/rugisirikewipefepa.pdf
    • https://cdn.shopify.com/s/files/1/0438/2133/4690/files/49059489687.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0401/files/kidde_smoke_and_carbon_monoxide_alarm_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/4630/4925/files/xotezavuwabet.pdf
    • https://cdn.shopify.com/s/files/1/0438/2133/4688/files/togav.pdf
    • https://cdn.shopify.com/s/files/1/0434/6868/5464/files/furuwaxanilena.pdf
    • https://cdn.shopify.com/s/files/1/0430/0079/1191/files/the_fall_albert_camus_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2871/files/associer_pages.pdf
    • https://cdn.shopify.com/s/files/1/0434/0052/8033/files/pmi_agile_certified_practitioner_pmi_acp.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/calendario_serie_a_2020.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_off00006738.bin
2ce323294b015f3fdab46725e609b3d146c05f6cd5990e25dcb480f9407da7ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6738 5420 bytes
font_01_sfnt_off00007974.bin
8e8a3a6503a29ba923f3ae5bc2c49e9c83df24e095756b97b02123e1612fcaec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7974 10132 bytes
font_02_sfnt_off00009c2b.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C2B 4324 bytes

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