Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6673a4f84ba47f4…

MALICIOUS

PDF

52.8 KB Created: 2020-08-30 01:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdf39448032a57dfaf9d3b96fc3e098e SHA-1: ce4a5bb5d168c3b4abdeb6a3b69177770aae5246 SHA-256: f6673a4f84ba47f4935e7bea3b83eb2925642ba26f33a3b130cd09da95f10e76
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'Dnd 5e wizard guide'. The primary malicious IOC is the redirector URL, which likely leads to further malicious content. The PDF also contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning attempt to mask the malicious redirect.

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=dnd+5e+wizard+guide
    • https://static.usrfiles.com/ugd/b8c837_6284ee5ef7f74cc293fa6d99cbb42d45.pdf
    • https://static.usrfiles.com/ugd/dd4472_6970e5beea70446a993b1ff3a889c638.pdf
    • https://static.usrfiles.com/ugd/7598fa_685fc9d24d65449bbd4b2b37adf67ea3.pdf
    • https://static.usrfiles.com/ugd/97368a_724fa9fdcc3446de85766d321a2cd501.pdf
    • https://static.usrfiles.com/ugd/b8c837_0575b038a9734f3d914b65e489cd4a48.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8a828d5db344b34b4a16364c9714aa7.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba5fa293ed1a4ec099233b8be7ab6b80.pdf
    • https://cdn.shopify.com/s/files/1/0428/7011/2423/files/pepalidilu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0944/0933/files/caring_for_your_baby_and_young_child_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/5125/9803/files/batching_plant_maintenance.pdf
    • https://cdn.shopify.com/s/files/1/0437/7070/8125/files/82628875423.pdf
    • https://cdn.shopify.com/s/files/1/0429/2352/4255/files/aide_mmoire_tuyauterie.pdf
    • https://cdn.shopify.com/s/files/1/0434/3978/4103/files/street_fighter_4_hd_android_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/0623/8626/files/42262777736.pdf
    • https://cdn.shopify.com/s/files/1/0440/0149/3142/files/kasogodukuridalodatixeri.pdf
    • https://cdn.shopify.com/s/files/1/0433/5661/8917/files/2574033472.pdf
    • https://cdn.shopify.com/s/files/1/0428/1909/2647/files/33656209815.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_off00009206.bin
81bd7808428ad28fa2a1dea41490190203934f9217f33286d5389a3ec2d6a3e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9206 5048 bytes
font_01_sfnt_off0000a359.bin
0480e13507e04e60154b80a2b837f09a62539a5f274d5d846ecb2833228e1d46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA359 10332 bytes

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