Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b595070a0076a18…

MALICIOUS

PDF

39.7 KB Created: 2020-08-29 23:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3340843184ff72cac0582c5b64b335bc SHA-1: 9dd3eadee7abece9866ab679636d5ca12c884a17 SHA-256: 4b595070a0076a18423d71c1a771af52e49cdbdcc83cedbe5c9b8486b423642c
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'purble place descargar para celular' and the malicious URL. This suggests a social engineering lure to redirect the user to potentially malicious content. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, likely for SEO manipulation or to distribute further malicious content.

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.ru/wix?keyword=purble+place+descargar+para+celular
    • https://cdn.shopify.com/s/files/1/0429/3391/1705/files/govadaru.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/affidavit_forms_uk.pdf
    • https://cdn.shopify.com/s/files/1/0437/4711/5157/files/27894564243.pdf
    • https://cdn.shopify.com/s/files/1/0436/6431/0425/files/ff14_fishing_guide_50-_60.pdf
    • https://cdn.shopify.com/s/files/1/0432/3393/5519/files/34065350739.pdf
    • https://cdn.shopify.com/s/files/1/0433/7742/6584/files/mamotu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8271/9127/files/dedumatawoboko.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/banen.pdf
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/zinatil.pdf
    • https://cdn.shopify.com/s/files/1/0432/3685/1874/files/cutting_edge_advanced_student_book.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d446cceadcc4ca2a3c1b337e1b4dde6.pdf
    • https://static.usrfiles.com/ugd/067ecb_98cf75c4ac0843dd9799308d11f9bf3e.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8388d73db444d69a14b93bc18b36f80.pdf
    • https://static.usrfiles.com/ugd/b65acf_48946ee3fda34797a21246dcd81536ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3902005ac65449fa4739ab3008de5bf.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_off000051aa.bin
c7e6664fc6907fcbb245eb2d848361bec7e18fce7a52bbe145a0b758eef84738		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51AA 4920 bytes
font_01_sfnt_off00006262.bin
a57b1401def2bdb6dffff7f57eae8d6d254b521177d2a298b5ce84514a4d419d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6262 9680 bytes
font_02_sfnt_off00008388.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8388 4324 bytes

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