Malicious PDF — malware analysis report

Static analysis result for SHA-256 654554d213cf2df7…

MALICIOUS

PDF

74.2 KB Created: 2020-09-13 08:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc9f47caa74fa16e0e91c04718519121 SHA-1: 312c27b90c1833e4ed96986f674165bad72bb9c4 SHA-256: 654554d213cf2df71b2686eabca8667da25efb4b5f4488a2f85e6b8cc6871439
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a worksheet title, which leads to a link farm of other PDFs. This suggests a phishing or SEO poisoning campaign aimed at driving traffic to potentially malicious or unwanted content. The ML classifier strongly supports the malicious verdict.

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.me/wix?keyword=shallow+seas+bbc+planet+earth+series+video+worksheet+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/mi_a3_android_10_update_release_date.pdf
    • https://cdn.shopify.com/s/files/1/0431/8494/7357/files/56198515944.pdf
    • https://cdn.shopify.com/s/files/1/0428/6346/0508/files/26860952652.pdf
    • https://cdn.shopify.com/s/files/1/0440/6365/4040/files/swa_cable_gland_size_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/6533/5190/files/pewozivetajome.pdf
    • https://static.usrfiles.com/ugd/3e9e83_69b86e76b551453f9b441d6575ed87e7.pdf
    • https://cdn.shopify.com/s/files/1/0439/8232/3870/files/borderlands_2_solo_class_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/0277/3156/files/77185940525.pdf
    • https://cdn.shopify.com/s/files/1/0432/7089/7824/files/11th_botany_practical_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/4437/0594/files/42298277990.pdf
    • https://static.usrfiles.com/ugd/b8c837_593548b0b5c1493f8bb286054310df6f.pdf
    • https://static.usrfiles.com/ugd/cd79e3_723ba119b9cc402f93824fbcf81a2e96.pdf
    • https://static.usrfiles.com/ugd/185811_0a34335625d5453684d3053aa2418433.pdf
    • https://static.usrfiles.com/ugd/d13e1f_01d287c5fbec48bcb1fc3e822fea1a63.pdf
    • https://static.usrfiles.com/ugd/a98ecc_44eb6354271442fc98dc2c7ff49afa3f.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c24b.bin
f19676f892b197b3eaf520c46ad07f9efe21fc27a32d95a018b3d590961df036		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC24B 5620 bytes
font_01_sfnt_off0000d577.bin
1937d9a1c8b1693e8d4f8328578ff6caf00b8dd062847d1c46295bbdb8bde409		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD577 15424 bytes
font_02_sfnt_off000105c2.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C2 16092 bytes

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