Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d34786c689b0ffd…

MALICIOUS

PDF

72.0 KB Created: 2020-08-29 21:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5690bae3712293fe2ce8eb6180e1f11b SHA-1: 48e87857cc331e9e9e8278b5ea939aa11a742651 SHA-256: 5d34786c689b0ffd9dd7ce73d0d5570980847b01fa2860644332621fafdc2b84
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to external PDF files, which is indicative of SEO link farming or a similar traffic-driving scheme. One of the primary links directs to a known malicious redirector, suggesting a malicious intent to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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=karan+vijay+chetan+singapore
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0435/4654/2229/files/sma_sunny_boy_spec_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/7935/8869/files/faa_ac_20_130a.pdf
    • https://cdn.shopify.com/s/files/1/0430/3349/3658/files/statistical_quality_control_douglas_c_montgomery.pdf
    • https://cdn.shopify.com/s/files/1/0437/7447/6440/files/second_conditional_reading_comprehension_exercises.pdf
    • https://static.usrfiles.com/ugd/b8c837_527e1dd520674f53a0cf9c4579a140c3.pdf
    • https://static.usrfiles.com/ugd/2ac701_436460efc0ab451ab588108978baa3fe.pdf
    • https://static.usrfiles.com/ugd/353d00_e788014615f34c91975d7c55e944f2f1.pdf
    • https://static.usrfiles.com/ugd/b52961_590f5033b54e40db99a0a0a2c440ec9d.pdf
    • https://static.usrfiles.com/ugd/b8c837_5277eca5a5074731b7d767ee6dcde841.pdf
    • https://static.usrfiles.com/ugd/b8c837_950f4480af9747f4ad58c4cec5241e0c.pdf
    • https://static.usrfiles.com/ugd/b8c837_549c9876e97844ce934c9dd34441b7b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_24eca2a73b324c8b913d0c713845b476.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://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5e0.bin
db3b7fc8e0e6b957f7407f71152f6916c8f4416b3bd81fced867e8543e61f9cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E0 5372 bytes
font_01_sfnt_off0000c832.bin
6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC832 3720 bytes
font_02_sfnt_off0000d394.bin
af646ee19688573cbd1187462e39c027f48e3925b7bd55fa9a99afd63ec66a10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD394 3464 bytes
font_03_sfnt_off0000e16a.bin
63ad7f8361fc6b33808a29f30cef16c3495e07265cbf50b118af4697e8104e0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE16A 15884 bytes

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