Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b60dea7c7d6eac…

MALICIOUS

PDF

44.8 KB Created: 2020-09-07 08:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 236696a4353c8e63a32f90968afd22a4 SHA-1: 0f2a4ed79ae831bcbfea69d241e4ccbd8dd83536 SHA-256: 87b60dea7c7d6eacaf24b1cb05f6dc33adfa2d62493d2c2a7e6379937059718b
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of embedded links, forming a link farm. The document body, though heavily obfuscated, contains text related to 'synonyms and antonyms worksheets for grade 1' and the malicious URL. The primary malicious URL is a redirector, likely leading to a further stage of attack.

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.link/wix?keyword=synonyms+and+antonyms+worksheets+for+grade+1
    • https://cdn.shopify.com/s/files/1/0434/3663/8369/files/chacha_video_calling_app.pdf
    • https://cdn.shopify.com/s/files/1/0434/1356/9690/files/avery_templates_5160_for_pages.pdf
    • https://cdn.shopify.com/s/files/1/0434/3237/8517/files/adverbial_phrase_exercise.pdf
    • https://cdn.shopify.com/s/files/1/0430/3365/7507/files/wufuderiwenizowi.pdf
    • https://static.usrfiles.com/ugd/b8c837_03d86b7417ca4d8ea362872ef1700ea5.pdf
    • https://static.usrfiles.com/ugd/87b9a8_cfe42d8a7b3b4f538285ec68dc538948.pdf
    • https://static.usrfiles.com/ugd/aff7ca_9ab420d15c854353885054c8f72d5c80.pdf
    • https://static.usrfiles.com/ugd/b8c837_506f562396bf4f09bcbc7d1bd30129cd.pdf
    • https://static.usrfiles.com/ugd/22bf55_a4568c0b0fef438c91d9ef0c48377bd1.pdf
    • https://cdn.shopify.com/s/files/1/0437/3538/4225/files/manhattan_logic_games.pdf
    • https://cdn.shopify.com/s/files/1/0431/9235/2932/files/counter_uav.pdf
    • https://cdn.shopify.com/s/files/1/0432/0090/5373/files/tavepaxutosevimeji.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/razurafe.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1703/files/45017262550.pdf
    • https://cdn.shopify.com/s/files/1/0436/1355/2802/files/isrs_4400_report_format.pdf
    • https://cdn.shopify.com/s/files/1/0457/5464/6684/files/26159696276.pdf
    • https://cdn.shopify.com/s/files/1/0435/4428/1247/files/40157465124.pdf
    • https://cdn.shopify.com/s/files/1/0437/6759/5165/files/the_babylonian_talmud_free_download.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_off00006cbf.bin
f5982512b3b0e4d78c692f074dc32dabd6ca93f1390db940cdf1d1374231d4f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBF 5704 bytes
font_01_sfnt_off0000801b.bin
3be06ab0d90a88e37e56bfdd263533bd100d6ef016a5986bc300051f8d41c76c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x801B 11524 bytes

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