Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5a4f5a33f6534b…

MALICIOUS

PDF

38.8 KB Created: 2020-10-02 23:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: f7614840b3e1edeb6854a035b82b2d7d SHA-1: 9a145328be4c8ff29e6819b609974e1fbe3d918e SHA-256: 4b5a4f5a33f6534b39df0e26499da1059218cb73666e0af51d0cba89a3ea82cf
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple embedded URLs, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Gmd immersive pro apk free download' and references to the URLs. This suggests the document is designed to trick users into visiting malicious sites, likely for software piracy or malware distribution.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/strik?keyword=gmd+immersive+pro+apk+free+download In PDF document text
    • http://siwozag.sswfinc.com/uploads/1/3/0/8/130814526/bukibifipapu-wumixidojeb-tojiluvokud.pdfIn PDF document text
    • http://files.connorshillgospelhall.com/uploads/1/3/2/6/132681969/1230ef176336.pdfIn PDF document text
    • http://fenefo.onecfi.com/uploads/1/3/2/6/132695471/3563123.pdfIn PDF document text
    • https://site-1039444.mozfiles.com/files/1039444/nofanozizifonosupuxe.pdfIn PDF document text
    • https://site-1039562.mozfiles.com/files/1039562/11922161640.pdfIn PDF document text
    • https://site-1036991.mozfiles.com/files/1036991/13554845066.pdfIn PDF document text
    • https://site-1039219.mozfiles.com/files/1039219/72774208927.pdfIn PDF document text
    • http://pogular.desireandsuccess.com/uploads/1/3/1/3/131383613/3177683.pdfIn PDF document text
    • http://fexurob.shelbyveterinaryservice.com/uploads/1/3/0/7/130776783/ca35eeb19b.pdfIn PDF document text
    • http://nikeko.wickycandlesllc.com/uploads/1/3/1/4/131407082/73e6018.pdfIn PDF document text
    • http://files.claraadolphs.com/uploads/1/3/1/1/131163684/kogovizo_kuvexuvonekuxep_kenoxopogejax_luresevoseveka.pdfIn PDF document text
    • https://site-1038901.mozfiles.com/files/1038901/kegeguliluwiduwaku.pdfIn PDF document text
    • https://site-1036957.mozfiles.com/files/1036957/rudakesapuzitorizeviwe.pdfIn PDF document text
    • https://site-1036639.mozfiles.com/files/1036639/divijiwisopefata.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DCE 3384 bytes
SHA-256: d9dd2fbd921adba1d48ad099e4b43b36a27a32e88a03916845115a67238137bd
font_01_sfnt_off00005a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A08 5432 bytes
SHA-256: 12360704f2890ab4ea28b27e001b26b36f23dac94c5b66b34147e09e1c22574a
font_02_sfnt_off00006c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C89 9872 bytes
SHA-256: de358379bd1931293783467f4cc00307497749caaa26c42bb222e813c390cbed

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