Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5edbcb4e6aa8e04…

MALICIOUS

PDF

43.1 KB Created: 2020-08-11 18:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7ea1cb4a1736a5fde4cffe4ac8760bb SHA-1: 86b751ef10a2a897066a2e161a833292d5a99961 SHA-256: c5edbcb4e6aa8e04060ae518de7007c814afd20ec493e0ecc489e366a167d296
154 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 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL and numerous other URLs, many hosted on cdn.shopify.com, suggesting a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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.ru/wb?keyword=learn%20french%20through%20english%20pdf
    • http://files.maxthemobileman.co.nz/uploads/1/3/1/4/131437157/pejisukum_bubadojamos.pdf
    • http://vototesak.mkbergh.com/uploads/1/3/0/9/130969358/zomalug_zoloreperaba_duwulenuzipa_sotalobojutarin.pdf
    • http://files.redesigntrinitycv.org/uploads/1/3/1/4/131406518/114306e2d1bb.pdf
    • http://files.111sage.com/uploads/1/3/0/8/130814127/lerunu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/java_default_parameter_value.pdf
    • https://cdn.shopify.com/s/files/1/0431/3192/8740/files/pyro_process_in_cement_plant.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/58015251998.pdf
    • https://cdn.shopify.com/s/files/1/0430/2677/6227/files/jubodufivamofupe.pdf
    • https://cdn.shopify.com/s/files/1/0436/8403/6761/files/jadukewirolifu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0245/4428/files/36202343100.pdf
    • https://cdn.shopify.com/s/files/1/0430/7809/0901/files/ashrae_air_conditioning_system_design_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/31755281148.pdf
    • https://cdn.shopify.com/s/files/1/0428/0382/2755/files/apollonius_argonautica.pdf
    • https://cdn.shopify.com/s/files/1/0436/5654/4409/files/possessive_adjectives_exercises_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/wobasukozivuzomitot.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/garizap.pdf
    • https://cdn.shopify.com/s/files/1/0431/1891/9837/files/properties_of_skew_symmetric_matrix.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a65.bin
17dadb9097a2df34dd541aa3e7b21f952ed9ea6b19a9ab3dc042ed6924b79461		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A65 5360 bytes
font_01_sfnt_off00007c96.bin
eb6e9daaefc87d4d655efdc4f10c885e6ee00096bc14858be5060b4ed55c6a82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C96 10344 bytes

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