Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb99b7eff62775d2…

MALICIOUS

PDF

46.2 KB Created: 2020-09-02 14:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9af5358976bb5727f1d7a6f7e259774 SHA-1: cdb3c3ea11f2a4ad36784ad44c19b5bf92464199 SHA-256: cb99b7eff62775d2b220f088f16b800f1c2f807d834a5ecee7b433aeae6d82cc
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at 'https://ttraff.me/wix?keyword=recurso+del+metodo+alejo+carpentier+pdf'. This suggests the document is designed to redirect users to malicious sites, likely for phishing or malware delivery. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded URLs and heuristic firings are sufficient to infer the attack pattern.

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=recurso+del+metodo+alejo+carpentier+pdf
    • https://static.usrfiles.com/ugd/b8c837_ac12d57502c74ed1a228633ad36d55bc.pdf
    • https://static.usrfiles.com/ugd/0a052f_5b77caf401604c468e76332ca37a1e64.pdf
    • https://static.usrfiles.com/ugd/368de4_ac749791830c4aa3ac2bab38e2211197.pdf
    • https://static.usrfiles.com/ugd/b8c837_4fe9ca3e4ebf4cb6be6b9aff8f9824a2.pdf
    • https://static.usrfiles.com/ugd/2d1648_e6b112f1ff00436da4af40e339a1b272.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0063/files/49287445331.pdf
    • https://cdn.shopify.com/s/files/1/0431/0496/0661/files/callen_thermodynamics_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/1095/7210/files/67601027960.pdf
    • https://cdn.shopify.com/s/files/1/0430/8523/4338/files/gavonawizotu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1236/6231/files/canon_imageclass_mf3010_scanner_driver.pdf
    • https://static.usrfiles.com/ugd/b8c837_cea0e7fddef34c329f71ace3b7fb39fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b86ac5d3a4c43088823d502d87f9643.pdf
    • https://static.usrfiles.com/ugd/594ae5_107c41a74d034dd09b9fb4e041e22a24.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_off000064fa.bin
aae770ba0ca44ec86e536787b3f4e53c12cc22b1796de14c323e010d8965a112
pdf-font-stream PDF embedded font (sfnt) at offset 0x64FA 5264 bytes
font_01_sfnt_off000076cc.bin
82bf2551abc75d1c60880ceb4d3e57e90f8738ebb89534fc396f906e723f03fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x76CC 11924 bytes
font_02_sfnt_off00009c23.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C23 4324 bytes