Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b357b6481483d7e…

MALICIOUS

PDF

52.2 KB Created: 2020-09-06 21:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de288b858bc85ca9f1faf1bf0907417b SHA-1: 30010f98e63a48696b4b36e3dc824cbfbad56abb SHA-256: 8b357b6481483d7e41dcfbae097238f9664d6fd939fbc7bcb5f72725a03420c2
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure at 'https://ttraff.club/wix?keyword=calman+home+for+lg'. Another heuristic indicates a PDF link farm, with the first URL pointing to 'https://cdn.shopify.com/s/files/1/0429/9702/2879/files/look_kg_171.pdf'. The ML classifier strongly flagged this PDF as malicious. The document body contains garbled text but also includes the malicious URL, suggesting a lure to external 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.club/wix?keyword=calman+home+for+lg
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/look_kg_171.pdf
    • https://cdn.shopify.com/s/files/1/0430/0413/3525/files/appendix_5a_in_word_format.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/21316778420.pdf
    • https://cdn.shopify.com/s/files/1/0432/4681/3346/files/aromatherapy_advice_essential_oil_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7345/files/30501463770.pdf
    • https://static.usrfiles.com/ugd/b8c837_a1ac3b661c8f48688e38482448d49d01.pdf
    • https://static.usrfiles.com/ugd/041b56_2953727b3ca941398d7ba79c9573eb8c.pdf
    • https://static.usrfiles.com/ugd/7ef0dc_f904a0a7fda946e5aa1b85682fd61bec.pdf
    • https://static.usrfiles.com/ugd/cb2bed_77dd4b8c974547a8a2b4c14548214f56.pdf
    • https://cdn.shopify.com/s/files/1/0431/8196/5461/files/44950180618.pdf
    • https://cdn.shopify.com/s/files/1/0429/6183/0037/files/38878323376.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/66144267203.pdf
    • https://cdn.shopify.com/s/files/1/0427/9376/2975/files/10881390203.pdf
    • https://cdn.shopify.com/s/files/1/0434/4853/3144/files/andrew_lloyd_webber_pie_jesu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7397/8011/files/maple_leaf_foods_annual_report_2016.pdf
    • https://cdn.shopify.com/s/files/1/0429/8906/0259/files/partition_piano_trop_beau_lomepal.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_off00007f1e.bin
6a969b455ef6804f9dd15fb3b641e0adb9f26164d70bb2dc397922ab5c68630e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F1E 4684 bytes
font_01_sfnt_off00008ed2.bin
855dddc9940129176d7a7f405faae945370eb40201d46b54b5e00157d79da6cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED2 11368 bytes
font_02_sfnt_off0000b569.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB569 4324 bytes

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