Malicious PDF — malware analysis report

Static analysis result for SHA-256 040a050249a11c92…

MALICIOUS

PDF

45.0 KB Created: 2020-09-02 09:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28eba9b2b0b07fbcc62294923b52832c SHA-1: 3e0a648d209205f40f9e8f177764ebf036935202 SHA-256: 040a050249a11c92a2c9146f8a916365a74d3eebad60bc44923630d94392f6d1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting an attempt to manipulate search engine results or direct users to potentially 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.cc/pify?keyword=bottom+navigation+bar+android+androidhive
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/a838c0_a56d71943d5449058aa86a71a275e578.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e4edeb7eac9486495861ed7cc940004.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_4efc6d90df134c13ab854ffe8b717834.pdf
    • https://static.usrfiles.com/ugd/7e6083_dc37fbd1cf21473d92c486ec701b485e.pdf
    • https://static.usrfiles.com/ugd/269bb8_3abf965b034440198aecaa4f7647da00.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a738bd1569b4c1b8ac1690591a78efb.pdf
    • https://static.usrfiles.com/ugd/576447_57160b5b254248c4a783c2c985fd7e29.pdf
    • https://static.usrfiles.com/ugd/008e52_c7927fbc0bda4e9baed7367b7199afb5.pdf
    • https://static.usrfiles.com/ugd/f3cb45_0217d63beb9b4ec9b46da87880a15339.pdf
    • https://static.usrfiles.com/ugd/41f880_e91698adeb6645b493acaff374d6350a.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_de2d8276635e4763b768a83ab77915f8.pdf
    • https://static.usrfiles.com/ugd/906e9f_dd941e3eb77140c88041f6c20de4f370.pdf
    • https://static.usrfiles.com/ugd/b3bc21_94b9826d804c4ad1b1dfb699ffc52462.pdf
    • https://cdn.shopify.com/s/files/1/0430/1222/7225/files/62866671044.pdf
    • https://cdn.shopify.com/s/files/1/0432/4281/5643/files/38139593180.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2906/files/74918538597.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/lisexuvinuragosuzevux.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006634.bin
134d29f16282cb97ec130357c5cc8bdf672a1a22039569b1d6c2e6a7758ceec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6634 5280 bytes
font_01_sfnt_off00007800.bin
14d278d2665f403bfbe002193794498f71b5f78838f36a1f7c3fa4001122ef11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7800 15008 bytes

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