Malicious PDF — malware analysis report

Static analysis result for SHA-256 19dbb6b21180da14…

MALICIOUS

PDF

58.6 KB Created: 2020-08-29 07:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c49113b32672c77c1062600d3940f5f SHA-1: 0490859a6f29ad2b4639185756da5a7d921019b0 SHA-256: 19dbb6b21180da14f572bf4af6ac2e9bc2377f73365fcebb931e379b3fe4f6a9
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. It also contains a mass external PDF link farm, with numerous links hosted on static.usrfiles.com. The ML classifier strongly indicated maliciousness. The document body contains obfuscated text and a URL that appears to be part of a SEO spam campaign, likely intended to drive traffic to malicious sites or distribute malware.

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=super+smash+bros+brawl+emulator
    • https://static.usrfiles.com/ugd/b8c837_cbb4566d3180455193c32bfc14173f06.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce25419a61c74557bba30b2c99e307f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e4edeb7eac9486495861ed7cc940004.pdf
    • https://static.usrfiles.com/ugd/b8c837_59695fcc05a440de9294fc6648cc2293.pdf
    • https://static.usrfiles.com/ugd/b8c837_f68bb4c00cd64a19912674786f0f43a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1b71bd8dc2341089eb6003c198f5a97.pdf
    • https://static.usrfiles.com/ugd/b8c837_4630a70247cc49f3917e3f1af42315cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d8de324a7ad4c1e9be21432f537f8eb.pdf
    • https://cdn.shopify.com/s/files/1/0438/2906/7938/files/20242521678.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2226/files/naradilawadexagurabolug.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/zebezowugipowidusidij.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/21448873513.pdf
    • https://cdn.shopify.com/s/files/1/0429/5848/7703/files/pearson_physical_science_textbook_answers.pdf
    • https://static.usrfiles.com/ugd/b8c837_feb4ded13b18475f87ee62feb8003bf0.pdf
    • https://static.usrfiles.com/ugd/b8c837_aca4c2f294084a67a36027cb9138f938.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000091e9.bin
fe6097ef0bdfc4244ec0de25930eaaa39932c4585d1c4aa553ae6eecd64404f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91E9 4728 bytes
font_01_sfnt_off0000a253.bin
fea2017f6a78e2e5c722ad2cdb6b69a64bb929b5a671283d20785c14c1c0ebb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA253 5392 bytes
font_02_sfnt_off0000b48e.bin
94c99e825a054461ac6eed323199b54c1af901acec5eae74af1ba590527de391		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB48E 12416 bytes

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