Malicious PDF — malware analysis report

Static analysis result for SHA-256 23dcdfd985b6b41c…

MALICIOUS

PDF

46.0 KB Created: 2020-07-30 20:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3f6153591ada821c3f5a8b353f7a9b2 SHA-1: dc8022135edd3553a6c4cdcd8af5bb94c48a7b08 SHA-256: 23dcdfd985b6b41c1082c7961478a2aa1c806edc784decf6663a637a594f8e98
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of embedded links, indicating a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is a redirector, suggesting an attempt to obscure the final destination, likely a phishing or malware distribution site. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, but the presence of numerous links points to a delivery mechanism for external threats.

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=bank+exam+today+monthly+current+affairs+pdf
    • http://files.desireejciscoheartanddesign.com/uploads/1/3/1/8/131872149/9850805.pdf
    • http://files.startatravelbusiness.com/uploads/1/3/1/4/131453543/ribopusub_jekefederam_bogofowadoku.pdf
    • http://files.lawyerslendahand.org/uploads/1/3/2/6/132683154/9756614.pdf
    • http://files.startatravelbusiness.com/up
    • https://cdn.shopify.com/s/files/1/0434/8539/7152/files/safowakin.pdf
    • https://cdn.shopify.com/s/files/1/0431/4637/9426/files/gudonedumebeziwigarax.pdf
    • https://cdn.shopify.com/s/files/1/0433/7251/1386/files/mitefugikure.pdf
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/sadolenik.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8104/files/28651870250.pdf
    • https://cdn.shopify.com/s/files/1/0428/0506/7943/files/kitowaxixon.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9815/files/69939435263.pdf
    • https://cdn.shopify.com/s/files/1/0428/8711/9007/files/14193295516.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4547/files/54289784397.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/dowurukenafabom.pdf
    • https://cdn.shopify.com/s/files/1/0430/7917/2257/files/takudetegibirisora.pdf
    • https://cdn.shopify.com/s/files/1/0438/8447/8632/files/favutelumikikino.pdf
    • https://cdn.shopify.com/s/files/1/0435/8491/3563/files/nekozomanowuf.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_off00007532.bin
8dcc33e4fe63e28cb5a5960c6dc8cb365f0ea446562080b5430828f5084df922		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7532 5560 bytes
font_01_sfnt_off000087f9.bin
d2c381b99c7245bef37da2bee30c7fe258f7a03a50eee00bd95ce7087286ca81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87F9 10164 bytes

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