Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fe8b553b687bffc…

MALICIOUS

PDF

45.8 KB Created: 2020-09-02 15:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf2df2ed8c6792dfdff8471b9b14284c SHA-1: ab0dc1a662e655b4bd8d218b1350a82ef2c3207e SHA-256: 0fe8b553b687bffca095da87f9ca024943d1a48c09010a31c9387b5f2c30e3e3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'California foreign language acknowledgement form pdf' and the malicious URL. The presence of a malicious redirector suggests an attempt to lead the user to a site that likely hosts further malicious content or phishing pages.

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/wix?keyword=california+foreign+language+acknowledgement+form+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/7183/1193/files/jupelijezod.pdf
    • https://cdn.shopify.com/s/files/1/0447/8989/1232/files/ketixoxi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0413/2508/files/bimoxakebowituz.pdf
    • https://static.usrfiles.com/ugd/19103d_46dbbea5b2e547038f9f733c5555b168.pdf
    • https://static.usrfiles.com/ugd/a474dd_655e1a3bdb7c4682b3eef88f2efbce1b.pdf
    • https://static.usrfiles.com/ugd/f96b02_8a904a6409e249ccab145f2deee72a89.pdf
    • https://cdn.shopify.com/s/files/1/0431/1895/2610/files/sakuvejujovamizamafal.pdf
    • https://cdn.shopify.com/s/files/1/0434/5085/9670/files/hotpoint_integrated_washing_machine_door_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/secondary_wastewater_treatment_process.pdf
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/minecraft_1._8_mods.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/wujagajorisonujupox.pdf
    • https://static.usrfiles.com/ugd/b8c837_c051c2ad37c547e49deeae9af09b1a8c.pdf
    • https://static.usrfiles.com/ugd/b8c837_f69ea42282094b68bd592068c6598635.pdf
    • https://static.usrfiles.com/ugd/f967ac_49cdd5c248b34a8cac36a9a043542d8b.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006836.bin
cf64c135f01c348f37b53338b92623ddc8f96f58192d4d882caca26af9e8586e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6836 5360 bytes
font_01_sfnt_off00007a73.bin
8127ac9c645f6e4a5ae33c6d3e62131bd77967a60ea7bfbe0ce0a8eab7c679a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A73 9832 bytes
font_02_sfnt_off00009c0d.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C0D 4324 bytes

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